#include<iostream>
#include<string>
using namespace std;
void xoa(string &s,int vt){
for(int i = vt;i < s.length()-1;i++){
s[i] = s[i+1];
}
s[s.length()] = '\0';
}
int main(){
string s;
string s1;
char x,y;
int count = 0;
getline(cin,s);
cin >> s1;
x = s1[0];y = s1[1];
//cin >> x >> y;
for(int i = 0;i < s.length();i++){
if(s[i] != x && s[i] != y){
xoa(s,i);
}
}
cout << s;
return 0;
}
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