python 3.6 tutorial for absolute beginner free 2019
num1,num2,num3=input("enter three numbers : ").split(",")
def grtst(a,b,c):
if a > b and a > c:
return a
elif b > a and b > c:
return b
elif c > a and c > b :
return c
print(grtst(int(num1),int(num2),int(num3)))
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