2021 THTB DANANG B2. Dịch cúm

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define db double


const int mm=1e6+5;
int d[100];
int main()
{
    freopen("corona.inp","r",stdin);
    freopen("corona.out","w",stdout);
    string s;
    getline(cin,s);
    for(int i=0;i<s.size();i++) d[s[i]]++;
    d['O']/=2;
    //cout<<d['C']<<" "<<d['O']<<" "<<d['']<<" "<<d['C']<<" "<<end;
    ll mi=min(d['C'],min(d['O'],min(d['R'],min(d['N'],d['A']))));
    cout<<mi;
   // printf("%d",min(min(sl['C'-'A'],sl['O'-'A']/2),min(min(sl['R'-'A'],sl['N'-'A']),sl['A'-'A'])));
}