package main

import "fmt"

func main() {
	var n, m int
	fmt.Scan(&n, &m)

	color := false
	for i := 0; i < n; i++ {
		for j := 0; j < m; j++ {
			var s string
			fmt.Scan(&s)
			if s == "C" || s == "M" || s == "Y" {
				color = true
			}
		}
	}

	if color {
		fmt.Println("#Color")
	} else {
		fmt.Println("#Black&White")
	}
}