So, this is the problem https://i.sstatic.net/2qaVn.png This is my code. while True: try: code = input() except EOFError: break if len(code) == 0: continue decode = '' for i in code: decode += chr(ord(i) - 7) print(decode) Example Input: [opz'pz'h'x|p{l'zpunsl'wyvislt5 PM'`V\'HYL'YLHKPUN'[OPZ3'`V\'TH`IL'OH]L'MV\UK'[OL'ZVS\[PVU5 Rllw'jvkpun'huk'{yhpupun'{opz'rpuk'vm'wyvisltz5'P['JV\SK'IL'YLHSS`'L_JP[PUN5 Zv555 TH`'[OL'JVKL'IL'^P[O'`V\5 Example Output: This is a quite single problem. IF YOU ARE READING THIS, YOU MAYBE HAVE FOUND THE SOLUTION. Keep coding and training this kind of problems. IT COULD BE REALLY EXCITING. So... MAY THE CODE BE WITH YOU. It works just fine but when I submitted to UVa it always gives me runtime error. What does possibly I do wrong here? Thank you. Continue reading...