import java.util.Scanner;

public class no2 {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int n = s.length();
        int st1 = 0;
        int st2 = 0;
        int count = 0;
        for(int j = 0;j < n;j++){
            char c = s.charAt(j);
            if(st1==0 && st2 ==0){
                if(c=='m') {
                    st1 = 1;
                }
            }else if(st1==1 && st2==0){
                if(c=='i') {
                    st2 = 1;
                    st1 = 0; 
                }else{
                    st1=0;
                }
            }else if(st1==0 && st2==1){
                if(c=='-'){}
                else if(c=='n'){
                    count +=1;
                    st2 = 0;
                }else{
                    st2 = 0;
                }
            }
            System.out.print(count);
        }
    }

}