#include<stdio.h>

int main(void){
  int i;
  char S[101];
  int n = 0, flag = 0;
  scanf("%s", S);
  for(i = 0; S[i] != '\0'; i++){
    if(flag == 0 && S[i] == 'm') flag = 1;
    else if(flag == 1 && S[i] == 'i') flag = 2;
    else if(flag == 2 && S[i] == '-') flag = 2;
    else if(flag == 2 && S[i] == 'n'){
      n++;
      flag = 0;
    }
    else flag = 0;
  }
  printf("%d\n", n);
  return 0;
}