// yukicoder: No.331 CodeRunnerでやれ
// bal4u 2019.8.15

#include <stdio.h>
#include <stdlib.h>

int action(char ch) {
	char s[20]; int d;
	while (1) {
		if (ch) {
			putchar(ch), putchar('\n');
			fflush(stdout);
		}
		scanf("%s", s);
		if (*s == 'M') exit(0);
		if ((d = atoi(s)) < 20151224) break;
		ch = 'F';
	}
	return d;
}
	
int main()
{
	int d = action(0);
	while (d) d = action('F');
	d = action('L');
	while (1) {
		if (d == 0) d = action('R');
		while (d == 0) d = action('L');
		while (d = action('F')) {
			d = action('R');
			if (d == 0) d = action('L');
		}
	}
	return 0;
}