ele "printa" o pv dos jogadres mesmo quando ela chega a negativo

a      = 0
pvk    = 50
pvr    = 50
somak  = 0
somar  = 0
ataque = 0
pvk_   = 1
pvr_   = 1
while(pvk > 0 and pvr > 0):
    ataque = int(input())
    if(ataque > 0):
        while(ataque > 0 and pvk_ > 0):
            somak  = somak+ataque
            pvk_   = pvk-somak
            ataque = int(input())
        print("Ken: {} - {} = {}" .format(pvk, somak, pvk_))
        pvk   = pvk_
        somak = 0
    elif(ataque < 0):
        while(ataque < 0 and pvr_ > 0):
            somar = somar-ataque
            pvr_ = pvr-somar
            ataque = int(input())
        print("Ryu: {} - {} = {}" .format(pvr, somar, pvr_))
        pvr   = pvr_
        somar = 0
    if (ataque > 0):
        while (ataque > 0 and pvk_ > 0):
            somak = somak + ataque
            pvk_ = pvk - somak
            ataque = int(input())
        print("Ken: {} - {} = {}".format(pvk, somak, pvk_))
        pvk = pvk_
        somak = 0
        if(ataque < 0):
            somar =ataque*(-1)
    elif (ataque < 0):
        while (ataque < 0 and pvr_ > 0):
            somar = somar - ataque
            pvr_ = pvr - somar
            ataque = int(input())
        print("Ryu: {} - {} = {}".format(pvr, somar, pvr_))
        pvr = pvr_
        somar = 0
        if (ataque > 0):
            somak = ataque
if(pvr > pvk):
    a = a+1
elif(pvk > pvr):
    a = a-1
pvk = 50
pvr = 50
pvk_ = 1
pvr_ = 1
ataque_ = ataque
if(ataque_ > 0):
    somak = ataque_
    pvk_ = pvk-ataque
    print("Ken: {} - {} = {}".format(pvk, somak, pvk_))
    somak = 0
    pvk = pvk_
elif(ataque_ < 0):
    somar = -ataque_
    pvr = pvr+ataque_
    print("Ryu: {} - {} = {}".format(pvr, somar, pvr_))
    pvr = pvr_
    somar = 0
while(pvk > 0 and pvr > 0):
    ataque = int(input())
    if(ataque > 0):
        while(ataque > 0 and pvk_ > 0):
            somak = somak+ataque
            pvk_ = pvk-somak
            ataque = int(input())
        print("Ken: {} - {} = {}" .format(pvk, somak, pvk_))
        pvk = pvk_
        somak=0
    elif(ataque < 0):
        while(ataque < 0 and pvr_ > 0):
            somar = somar-ataque
            pvr_ = pvr-somar
            ataque = int(input())
        print("Ryu: {} - {} = {}" .format(pvr, somar, pvr_))
        pvr = pvr_
        if (pvk <= 0 or pvr <= 0):
            break
        somar = 0
    if (ataque > 0):
        while (ataque > 0 and pvk_ > 0):
            somak = somak + ataque
            pvk_ = pvk - somak
            ataque = int(input())
        print("Ken: {} - {} = {}".format(pvk, somak, pvk_))
        pvk = pvk_
        if (pvk <= 0 or pvr <= 0):
            break
        somak = 0
        if(ataque < 0):
            somar =ataque*-1
    elif(ataque < 0):
        while(ataque < 0 and pvr_ > 0):
            somar = somar-ataque
            pvr_ = pvr-somar
            ataque = int(input())
        print("Ryu: {} - {} = {}" .format(pvr, somar, pvr_))
        pvr = pvr_
        if(pvk <= 0 or pvr <= 0):
            break
        somar = 0
        if(ataque > 0):
            somar = ataque
    elif (ataque < 0):
        while (ataque < 0 and pvr_ > 0):
            somar = somar - ataque
            pvr_ = pvr - somar
            ataque = int(input())
        print("Ryu: {} - {} = {}".format(pvr, somar, pvr_))
        pvr = pvr_
        if (pvk <= 0 or pvr <= 0):
            break
        somar = 0
if(pvk > pvr):
    a = a-1
if(pvr > pvk):
    a = a+1
if(a > 0):
    print("Ryu venceu")
if(a == 0):
    print("empatou")
if(a < 0):