master
nwerc-082 2016-11-19 10:42:12 +00:00
parent 2ec2ac57d2
commit 3605f3204f
1 changed files with 5 additions and 0 deletions

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C.py Normal file
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from __future__ import print_function
import sys
P = sys.stdin.readline().rstrip()
N = 26-len(set(P))
print(N if N != 0 else "impossible")