// ZOJ-1405Tanning Salon.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
#include<string>
#include<string.h>
using namespace std;

int main()
{
	int n;
	cin >> n;
	while (n!=0)
	{
		string str;
		int sum=1;
		int max=0;
		cin>>str;
		int len = str.length();
		char *ch = new char[len];
		strcpy(ch, str.c_str());
		char *ch1=new char[n];
		ch1[0] = ch[0];
		for (int k = 1; k < n; k++)
		{
			ch1[k] = '0';
		}
		for (int i = 1; i < len; i++)
		{
			sum++;
			int j;
			
			for ( j= 0; j < n; j++)
			{
				if (ch[i] == ch1[j])
				{
					sum = sum - 2;
					ch1[j] = '0';
					break;
				}
			}
			if (j<n)
				continue;
			if (sum>n)
			{
				for (j = 0; j < i; j++)
				{
					if (ch[i] == ch[j])
					{
						max--;
						break;
					}
				}
				sum = n;
				max++;
			}
			else
			{
				for (j = 0; j<n; j++)
				{
					if (ch1[j] == '0')
					{
						ch1[j] = ch[i];
						break;
					}
						
				}
				
			}

		}
		if (max>0)
		{
			cout << max << " customer(s) walked away." << endl;
		}
		else
		{
			cout << "All customers tanned successfully." << endl;
		}
		cin >> n;
		

	}
	return 0;
}