#include <bits/stdc++.h>
using namespace std;
typedef int64_t lint;

int main()
{
    string s;
    cin>>s;
    char stat=0;
    lint cnt=0;
    for(lint i=0;i!=s.size();i++){
        if(stat=0&&s[i]=='m'){
            stat='m';
        }else if(stat=='m'&&s[i]=='-'){
            stat='-';
        }else if(stat='-'&&s[i]=='n'){
            stat=0;
            cnt++;
        }else{
            stat=0;
        }
    }
    cout<<cnt<<endl;

    // system("pause");
}