#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#include <string.h>

int main()
{
	char str[101] = "";
	char min[4] = "";
	int cnt = 0;
	int minCnt = 0;

	scanf("%s", str);

	for (int i = 0;str[i] != '\0';i++)
	{
		if (str[i] == '-')
		{
			continue;
		}

		min[cnt] = str[i];
		cnt++;
		if (cnt == 3)
		{
			cnt = 0;
			if (strcmp("min", min) == 0)
			{
				minCnt++;
			}
		}
	}

	printf("%d\n", minCnt);

	return 0;
}