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[AtCoder]ABC-071|B - Not Found
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提出結果
def getString():
return input()
def az_array():
c = ord('a')
l = []
for i in range(26):
l.append(chr(c + i))
return l
def main():
s = list(getString())
t = list(set(s))
t.sort()
r = 'None'
for c in az_array():
if not c in t:
r = c
break
print(r)
if __name__ == "__main__":
main()
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