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OI-codes/AtCoder/ABC225/A/A.cpp

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#include <bits/stdc++.h>
using namespace std;
int ans;
string s;
int main() {
cin >> s;
sort(s.begin(), s.end());
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do
ans++;
while (next_permutation(s.begin(), s.end()));
cout << ans << endl;
return 0;
}