程序代码：

#include <stdio.h>
int main()
{
    int n, r, i;
    char s[16];
    while(scanf("%d", &n), n--)
    {
        scanf("%s", s);
        for(r = i = 0; i < n; r += (s[i++] == 'R'));
        printf("%s\n", (s[n] == 'B' && r == 7 || s[n] == 'L' && n - r < 7) ? "Red" : "Yellow");
    }
    return 0;
}