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[AtCoder]ABC-349|B - Commencement
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提出結果
def getString():
return input()
def main():
s = getString()
d = dict()
for c in s:
d.setdefault(c, 0)
d[c] += 1
c = dict()
for i in d.values():
c.setdefault(i, 0)
c[i] += 1
b = [0 if x == 2 else 1 for x in c.values()]
print('Yes' if sum(b) == 0 else 'No')
if __name__ == "__main__":
main()
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