#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(void) {
ios_base::sync_with_stdio(0);
cin.tie(NULL);
string bomb;
string str;
char ans[1000005];
cin >> str >> bomb;
int iter = 0;
for(int i = 0; i<str.length();i++){
ans[iter] = str[i];
iter++;
bool chk = false;
for (int j = 0; j < bomb.length(); j++) {
if (ans[iter - 1] == bomb[j]) {
chk = true;
break;
}
}
if (chk) {
iter--;
}
}
if (iter == 0) {
cout << "FRULA";
}
else {
for (int i = 0; i < iter; i++) {
cout << ans[i];
}
}
return 0;
}
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