#include<bits/stdc++.h>
using namespace std;
int main(){
    string s1,s2;
    cin>>s1>>s2;
    int p=-1;
        while(s1.find(s2,p+1)!=-1){
            p=s1.find(s2);
            s1.erase(p,1);
        }
        p=s1.find(s2);
        s1.erase(p,1);
    cout <<s1;
    return 0;
}
/**************************************************************
	Problem: 1131
	User: luyanchen
	Language: C++
	Result: Runtime Error
****************************************************************/