1 // All rights reserved.
  2 
  3 #include <iostream>
  4 #include <string>
  5 #include <sstream>
  6 using namespace std;
  7 string str[20];
  8 int t;
  9 string cmd;
 10 string detect();
 11 int num(int p=0);
 12 
 13 void print_all(string* str, int t){
 14     for(int i=0;i<t;i++){
 15         cout<<str[i]<<endl;
 16     }
 17 }
 18 bool isNum(string str)
 19 {
 20     stringstream sin(str);
 21     double d;
 22     char c;
 23     if(!(sin >> d)){return false;}
 24     if (sin >> c){return false;}
 25     return true;
 26 }
 27 int num(string p){
 28         return atoi(p.c_str());
 29 }
 30 
 31 string detect(){
 32     cin>>cmd;
 33     //cout<<cmd;
 34     if(cmd=="over")
 35         return "";
 36     else if(cmd=="add"){
 37         string a;
 38         string b;
 39         
 40         a=detect();
 41         b=detect();
 42         if(isNum(a)&&isNum(b)&&num(a)>=0&&num(a)<=99999&&num(b)>=0&&num(b)<=99999)
 43             return to_string(num(a)+num(b));
 44         else
 45             return a+b;
 46     }
 47     else if(cmd=="copy"){
 48         int xu,pos,len;
 49         xu=num(detect());
 50         pos=num(detect());
 51         len=num(detect());
 52         
 53         return str[xu-1].substr(pos,len);
 54     }
 55     
 56     else if(cmd=="find"){
 57         string search;
 58         int xu;
 59     
 60         search=detect();
 61         xu=num(detect());
 62         if(str[xu-1].find(search,0)!=string::npos)
 63             return to_string(str[xu-1].find(search,0));
 64         else
 65             return to_string((int)search.length());
 66     }
 67     else if(cmd=="rfind"){
 68         string search;
 69         int xu;
 70         
 71         search=detect();
 72         xu=num(detect());
 73         if(str[xu-1].rfind(search,str[xu-1].length()-1)!=string::npos) //rfind has a return value of npos
 74             return to_string(str[xu-1].rfind(search,str[xu-1].length()-1));
 75         else
 76             return to_string((int)search.length());
 77     }
 78         
 79     else if(cmd=="print"){          //以下是死操作（没有返回值
 80         int xu;
 81         
 82         xu=num(detect());
 83         //cout<<xu<<endl;
 84         cout<<str[xu-1]<<endl;
 85     }
 86     else if(cmd=="printall")
 87         print_all(str,t);
 88     
 89     else if(cmd=="insert"){
 90         string inserterr;
 91         int xu;
 92         int pos;
 93         
 94         inserterr=detect();
 95         xu=num(detect());
 96         pos=num(detect());
 97         str[xu-1].insert(pos,inserterr);
 98     }
 99     else if(cmd=="reset"){
100         string reseterr;
101         int xu;
102         
103         reseterr=detect();
104         xu=num(detect());
105         str[xu-1].assign(reseterr);
106     }
107     else
108         return cmd;
109     return "";
110 }
111 
112 int main(int argc, const char * argv[]) {
113     cin>>t;
114     string tmp;
115     for(int i=0;i<t;i++){
116         cin>>tmp;
117         str[i].assign(tmp);
118     }
119     while(cmd!="over"){
120     detect();
121     }
122     /*for(int i=0;i<t;i++){
123         cout<<str[i]<<endl;;
124     }*/
125     return 0;
126 }