#include<bits/stdc++.h>

using namespace std;

#define fRead(x)        freopen(x,"r",stdin)
#define fWrite(x)       freopen (x,"w",stdout)

#define LL              long long
#define ULL             unsigned long long
#define ff              first
#define ss              second
#define pb              push_back
#define INF             5e13
#define PI              acos(-1.0)
#define mk              make_pair
#define pii             pair<int,int>
#define pll             pair<LL,LL>
#define all(a)          a.begin(),a.end()
#define Unique(a)       sort(all(a)),a.erase(unique(all(a)),a.end())

#define min3(a,b,c)     min(a,min(b,c))
#define max3(a,b,c)     max(a,max(b,c))
#define min4(a,b,c,d)   min(a,min(b,min(c,d)))
#define max4(a,b,c,d)   max(a,max(b,max(c,d)))
#define SQR(a)          ((a)*(a))
#define FOR(i,a,b)      for(int i=a;i<=b;i++)
#define ROF(i,a,b)      for(int i=a;i>=b;i--)
#define REP(i,b)        for(int i=0;i<b;i++)
#define MEM(a,x)        memset(a,x,sizeof(a))
#define ABS(x)          ((x)<0?-(x):(x))

#define SORT(v)         sort(v.begin(),v.end())
#define REV(v)          reverse(v.begin(),v.end())

#define FastRead        ios_base::sync_with_stdio(0);cin.tie(nullptr);

string tok = "!@#$%^&*()-+";
set<char>st;
int main()
{
   REP(i,tok.size())st.insert(tok[i]);
   int n;
   cin >> n;
   string str;
   cin >> str;

   int lo = 0, up = 0 ,dig = 0, sp =0;
   REP(i,str.size()){
      if(st.find(str[i]) != st.end())sp = 1;
      if(str[i]>='0' and str[i]<='9')dig = 1;
      if(str[i]>='A' and str[i]<='Z')up = 1;
      if(str[i]>='a' and str[i]<='z')lo = 1;
   }
   int need = 4 - lo - dig - up - sp;
   int n2 = max(0,6 - n);
   cout << max(need,n2) << "\n";

}