import std.stdio;
import std.conv, std.array, std.algorithm, std.string;
import std.math, std.random, std.range, std.datetime;
import std.bigint;

void main(){
	string s = readln.chomp;
	
	int flag = 0;
	int count = 0;
	foreach(c; s){
		if(flag == 0){
			if(c == 'm') flag = 1;
			else flag = 0;
			}
		else if(flag == 1){
			if(c == 'i') flag = 2;
			else if(c == 'm') flag = 1;
			else flag = 0;
			}
		else if(flag == 2){
			if(c == 'n') count += 1, flag = 0;
			else if(c == '-') {}
			else if(c == 'm') flag = 1;
			else flag = 0;
			}
		}
	
	int ans = count;
	ans.writeln;
	}