import sys
N,M = map(int,input().split())

B = 'Black'
W = 'White'

q = []
masu = [[0] * (N+1) for _ in range(N+1)]
masu[1][1] = 1

q.append((1,1))
while len(q):
    x,y = q.pop()
    if x == N and y == N:
        print('Yes')
        exit()
        
    for i,j in [[1,0],[-1,0],[0,1],[0,-1]]:
        if 1 <= x+i <= N and 1 <= y+j <= N:
            if masu[x+i][y+j] == 0:
                print(x+i,y+j)
                T = input()
                if T == B:
                    masu[x+i][y+j] = 1
                    q.append((x+i,y+j))
                else:
                    masu[x+i][y+j] = -1
print('No')