Problem:
Search III

Your task is to write a program of a simple dictionary which implements the following instructions:

insert str: insert a string str in to the dictionary

find str: if the distionary contains str, then print 'yes', otherwise print 'no'

Input

In the first line n, the number of instructions is given. In the following n lines, n instructions are given in the above mentioned format.

Output

Print yes or no for each find instruction in a line.

Constraints

A string consists of 'A', 'C', 'G', or 'T'

1 ≤ length of a string ≤ 12

n ≤ 1000000

Sample Input 1

5
insert A
insert T
insert C
find G
find A

Sample Output 1

no
yes

Sample Input 2

13
insert AAA
insert AAC
insert AGA
insert AGG
insert TTT
find AAA
find CCC
find CCC
insert CCC
find CCC
insert T
find TTT
find T

Sample Output 2

yes
no
no
yes
yes
yes

Notes

Template in C

Solution in C (judge verdict: Time Limit Exceeded)

#include<stdio.h>
#include<string.h>
char dic[1000000][12];
int main(){
  int n;
  int top=0;
  char buf[12];
  int i,j;

  scanf("%d",&n);
  for(i=0;i<n;i++){
    scanf("%s",buf);

    if(strcmp(buf,"insert")==0){
      scanf("%s",dic[top]);
      top++;
    }
    else if(strcmp(buf,"find")==0){
      scanf("%s",buf);

      for(j=0;j<top;j++){
        if(strcmp(buf,dic[j])==0){
          printf("yes\n");
          break;
        }
      }
      if(j==top)printf("no\n");
    }
  }

  return 0;
}