I really don't understand why my solution is wrong but here it is:

letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
start = 0
s = input()

for i in range(0, len(s)):
    if not(s[i] in letters):
        word = s[start:i]
        other = s[i:i+1]

        if (word != ""):
            print(word[::-1], end="")

        print(other, end="")
        start = i+1

if (start != len(s)):
    print(s[start:len(s)][::-1], end="")

What's wrong with this solution?
WA (Test 2)

Edited by author 30.03.2013 23:10

I think that the input can be more than one line.