/*Intern Ni lgaa
*/
#include <bits/stdc++.h>
#define ll long long int
#define si1(a) scanf("%d",&a)
#define si2(a,b) scanf("%d%d",&a,&b)
#define si3(a,b,c) scanf("%d%d%d",&a,&b,&c)
#define sil1(a) scanf("%lld",&a)
#define sil2(a,b) scanf("%lld%lld",&a,&b)
#define sil3(a,b,c) scanf("%lld%lld%lld",&a,&b,&c)
#define MOD 1000000007
#define pb push_back
#define mp make_pair
#define pi1(a) printf("%d\n",a)
#define pi2(a,b) printf("%d%d",a,b)
#define pi3(a,b,c) printf("%d%d%d",a,b,c)
#define pil1(a) printf("%lld\n",a)
#define pil2(a,b) printf("%lld%lld",a,b)
#define pil3(a,b,c) printf("%lld%lld%lld",a,b,c)
#define dd double
using namespace std;
int main()
{
    string s;
    ll n,i,j,k,ctr=0,ctr1=0,ctr2=0,ctr3=0,ctr4=0,n1;
    sil1(n);
    n1=n;
    cin>>s;
    for(i=0;i<n;i++){
        if(s[i]>='a'&&s[i]<='z'){
            ctr++;
        }
        else if(s[i]>='A'&&s[i]<='Z'){
            ctr1++;
        }
        else if(s[i]>='0'&&s[i]<='9'){
            ctr2++;
        }
        else if(s[i]=='!'||s[i]=='@'||s[i]=='#'||s[i]=='$'||s[i]=='%'||s[i]=='^'||s[i]=='&'||s[i]=='('||s[i]==')'||s[i]=='-'||s[i]=='+'){
            ctr3++;
        }
    }
    if(!ctr){
        n++;
    }
    if(!ctr1){
        n++;
    }
    if(!ctr2){
        n++;
    }
    if(!ctr3){
        n++;
    }
    if(n<6){
        n=6;
    }
    pil1(n-n1);

    return 0;
}