1 #include<stdio.h>
2 #include<string.h>
3 int main()
4 {
5 char c,p[26];
6 int n,curnum,leave;
7 while(scanf("%d%*c",&n),n)
8 {
9 curnum=leave=0;
10 memset(p,0,sizeof(p));
11 for(c=getchar();c!='\n';c=getchar()){
12 if(p[c-'A']==1){
13 p[c-'A']=0;
14 curnum--;
15 }
16 else if(p[c-'A']==0){
17 if(curnum<n){
18 p[c-'A']=1;
19 curnum++;
20 }
21 else{
22 leave++;
23 p[c-'A']=2;
24 }
25 }
26 }
27 if(leave) printf("%d customer(s) walked away.\n",leave);
28 else printf("All customers tanned successfully.\n");
29 }
30 return 0;
31 }
