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

int main()
    
{
   
    int i1=0,i2=0,i3=0,i4=0,i5=0,rl=0,c=0,len=0,j=0;
    char ch[30];
    char sp[12];
    char ts[30];
    cin>>len;
    cin>>ch;
    if(strlen(ch)>=6)
    i5++;
    
    if(i5==0)
        rl=6-strlen(ch);
        
    //cout<<ch<<endl;
    for(j=0;j<strlen(ch);j++)
    {
        if(ch[j]>='a' && ch[j]<='z')
        {i1++;
         c++;
         //cout<<ch[j];
        break;}
    }
    //cout<<endl<<c;
    //cout<<endl<<j;
    
    for(j=0;j<strlen(ch);j++)
    {
        if(ch[j]>='A' && ch[j]<='Z')
        {i2++;
         c++;
        break;}
    }
    //cout<<endl<<c;
    for(j=0;j<strlen(ch);j++)
    {
        if(ch[j]>='0' && ch[j]<='9')
       {i3++;
        c++;
       break;}
    }
    //cout<<endl<<c;
    for(j=0;j<strlen(ch);j++)
    {
        if(ch[j]=='!')
        {i4++;
         c++;
        break;}
        
        else if(ch[j]=='@')
        {i4++;
         c++;
        break;}
        
        else if(ch[j]=='#')
        {i4++;
         c++;
        break;}
        
        else if(ch[j]=='$')
        {i4++;
         c++;
        break;}
        
        else if(ch[j]=='%')
        {i4++;
         c++;
        break;}
        
        else if(ch[j]=='^')
        {i4++;
         c++;
        break;}
        else if(ch[j]=='&')
        {i4++;
         c++;
        break;}
        else if(ch[j]=='*')
        {i4++;
         c++;
        break;}
        else if(ch[j]=='(')
        {i4++;
         c++;
        break;}
        else if(ch[j]==')')
        {i4++;
         c++;
        break;}
        else if(ch[j]=='-')
        {i4++;
         c++;
        break;}
        else if(ch[j]=='+')
        {i4++;
         c++;
        break;}
             
    }
    
    if(i5==0)   
    {if((4-c)>=rl)
    {
        cout<<(4-c); 
    }
    else
    {
        cout<<rl;
    }
    }
    else 
    {
        cout<<(4-c);
    }
   
    //cout<<endl<<c;
    //cout<<endl<<rl;

}