为什么20分！！！！

#include <bits/stdc++.h>
using namespace std;
int q;
string str;
int op;
string am;
int main(){
	cin>>q;
	cin>>str;
	while(q--){
		int m;
		cin>>op;
		switch(op){
			case 1:
				cin>>am;
				str+=am;
				cout<<str<<endl;
				break;
			case 2:
				int n;
				cin>>m>>n;
				str = str.substr(m,n);
				cout<<str;
				break;
			case 3:
				cin>>m>>am;
				str.insert(m,am);
				break;
			case 4:
				cin>>am;
				int loc = str.find(am);
				cout<<loc;
				break;
		}
	}
	return 0;
}