#include <stdio.h>

void chmax(int *a, int b)
{
	if (*a < b) *a = b;
}

int main()
{
	char S[1000001];
	scanf("%s", S);
	
	int i, ans = 0, tmp = 0, flag = 0;
	for (i = 0; S[i] != 0; i++) {
		switch (flag) {
		case 0:
			if (S[i] == 'y') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 1:
			if (S[i] == 'u') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 2:
			if (S[i] == 'k') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 3:
			if (S[i] == 'i') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 4:
			if (S[i] == 'c') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 5:
			if (S[i] == 'o') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 6:
			if (S[i] == 'd') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 7:
			if (S[i] == 'e') flag++;
			else {
				tmp = 0;
				flag = 0;
			}
			break;
		case 8:
			if (S[i] == 'r') {
				tmp++;
				chmax(&ans, tmp);
			} else tmp = 0;
			flag = 0;
			break;
		}
	}
	printf("%d\n", ans);
	fflush(stdout);
	return 0;
}