#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <ctype.h>

int main(){
    
    int n,cnt=0,i,diff=0;
    
    scanf("%d",&n);
    
    char str[n];
    
    int num=0,small=0,big=0,spc=0;
    
    scanf("%s",str);
    
    for(i=0;i<n;i++)
    	//printf("\nc=%c",str[i]);
    
    for(i=0;i<n;i++){
    	    	
    	if(isdigit(str[i])){
    		//printf("\nnum detect");
			num = 1;
		}
    		
    	else if(str[i]>='a' && str[i]<='z')
    		small = 1;
    		
    	else if(str[i]>='A' && str[i]<='Z')
    		big = 1;
			
		else if(str[i]=='!'
				|| str[i]=='@'
				|| str[i]=='#'
				|| str[i]=='$'
				|| str[i]=='%'
				|| str[i]=='^'
				|| str[i]=='&'
				|| str[i]=='*'
				|| str[i]=='('
				|| str[i]==')'
				|| str[i]=='-'
				|| str[i]=='+'){
					
			spc = 1;			
		}	
	}
	
	if(num==0)
		cnt++;
		
	if(small==0)
		cnt++;
		
	if(big==0)
		cnt++;
		
	if(spc==0)
		cnt++;
	
	if(n+cnt<6)
		cnt+=(6-(n+cnt));
		
	printf("%d",cnt);
}