poj1250

#include

#include

using namespace std;

int main(){

int n;

while(cin>>n&&n){

int ans=0,a[300]={0},h=0,b[300]={0};

char c[300];

cin>>c;

for(int i=0;i

{

if(a[c[i]]==0){

if(ans

ans++;a[c[i]]++;b[c[i]]=1;

}

else

{

a[c[i]]++;b[c[i]]=0;

}

} 

elseif(a[c[i]]==1&&ans<=n&&b[c[i]]==1){

ans--;

}

elseif(a[c[i]]==1&&ans<=n&&b[c[i]]==0){

h++;

}  

}

if(h==0)

 cout<<"All customers tannedsuccessfully."<<endl;

else

 cout<<h<<" customer(s) walkedaway."<<endl;

}

return 0;

}