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: Runtime Error)

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int find(char *,int);
char t[100000][12],q[100000][12],m[100000][12];
int main() {
	int n,i,j=0;
	char s[12],f[12];
	scanf("%d",&n);
	
	for(i=0;i<n;i++) {

scanf("%s%s",t[i],q[i]);
}
	for(i=0;i<n;i++) {

if(strcmp(t[i],"insert")==0) { 
strcpy(m[j],q[i]); j++;
}
else {
	if(find(q[i],j)==1) printf("yes\n");
	else printf("no\n");
	}
	}
	return 0;
	}
	
	int find(char *p,int j) {
		int i;
		for(i=0;i<j;i++) {
			if(strcmp(m[i],p)==0) return 1;
		}
		return 0;
	}