UVA-414 Machined Surfaces Solution in Python 

while True:
    x = int(input())
    if x == 0:
        break
    minimum = 25
    ls = []
    for i in range(x):
        s = input().strip()
        index1 = s.find(" ")
        if index1 >= 0:
            index2 = s.find("X", index1)
            delta = index2 - index1
            ls.append(delta)
            if delta < minimum:
                minimum = delta
        else:
            ls.append(0)
            minimum = 0
    result = 0
    for i in range(x):
        result = result + ls[i] - minimum
    print(result)

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