https://www.acmicpc.net/problem/9935
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Stack;
public class Main {
static String origin;
static String bomb;
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
origin = br.readLine();
bomb = br.readLine();
int oriLen = origin.length();
int bombLen = bomb.length();
StringBuilder sb = new StringBuilder();
for(int i=0;i<oriLen;i++){
sb.append(origin.charAt(i));
if(sb.length() < bombLen ) continue;
boolean isSame = true;
for(int j=0;j<bombLen;j++){
if(sb.charAt(sb.length()-bombLen+j) != bomb.charAt(j)) {
isSame = false;
break;
}
}
if(isSame) sb.delete(sb.length()-bombLen, sb.length());
}
if(sb.length() == 0) System.out.println("FRULA");
else System.out.println(sb.toString());
}
}