题目1111：单词替换

#include <iostream>
#include <algorithm>
#include <queue>
#include <vector>
#include <cstring>
#include <string>
#include <string.h>
#include <stdio.h>
#include <cmath>
#include <map>
#include <functional>
#include <set>
using namespace std;
//1111
string s,a,b;
int main(){
    //freopen("input.txt","r",stdin);
    while(getline(cin,s)){
        getline(cin,a);getline(cin,b);
        int p=s.find(a);
        while(p!=string::npos && s[p+a.size()]==' '||p+a.size()==s.size()){
            s.replace(p,a.size(),b);
            p=s.find(a);
        }
        cout<<s<<endl;
    }
    return 0;
}
/**************************************************************
    Problem: 1111
    User: cust123
    Language: C++
    Result: Accepted
    Time:0 ms
    Memory:1520 kb
****************************************************************/