program to find max prim of a two numbers number

# program to find max prim of a two numbers
x = int(input("write your 1st number : "))
if x == 0:
    print ("1st number equal to zero no prim number is possible")
    exit()
y = int(input("write your 2nd number : "))
if y == 0:
    print ("2nd number equal to zero no prim number is possible")
    exit()
if x == y:
    print ("same number given")
    i = x - 1
    while i > 0:
        if x % i == 0:
            print("max prim is : " + str(i))
            break
        else:
            i -= 1
else:
    if x > y:
        i = y
    else :
        i = x
    while i > 0:
        if x % i == 0 and y % i == 0:
            print("max prim is : " + str(i))
            break
        else:
            i -= 1