#include<iostream>
using namespace std;
int g[10010];
int main() {
string s;
cin >> s;
for (char c : s) {
g[c]++;
}
int m = 99;
for (char c : s) {
m = min(m, g[c]);
}
for (char c : s) {
if (g[c] != m) cout << c;
}
return 0;
}



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