import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


def answer(i, val):
    write(val)
    sys.stdout.flush()
    # write(f"Case #{i+1}: {val}")
# 標準出力による質問 interactive
import sys
# _l = [2,4,3,1,5,7,6]
# ans = list(range(len(_l)))
# ans.sort(key=lambda i: _l[i])
# ans = [ans[i] for i in range(len(ans))]
# def q(i,j,k):
#     v = sorted([i,j,k], key=lambda i: _l[i])
#     return v[1]
def query(x,y):
    print(x+1,y+1)
    sys.stdout.flush()
    res = input()
    if res=="Black":
        return 1
    elif res=="White":
        return 0
    assert 0
def sub(x,y):
    if done[x][y]:
        return
    global count
    count += 1
    res = query(x,y)
    if res:
        q.append((x,y))
    done[x][y] = 1
if __name__=="__main__":
    count = 0
    val = input()
    n,m = map(int, val.split())
    done = [[0]*n for _ in range(n)]
    q = [(0,0)]
    done[0][0] = 1
    while q:
        x,y = q.pop()
        if x==y==n-1:
            print("Yes")
            break
        if x+1<n:
            sub(x+1,y)
            if count>=3000:
                break
        if x-1>=0:
            sub(x-1,y)
            if count>=3000:
                break
        if y+1<n:
            sub(x,y+1)
            if count>=3000:
                break
        if y-1>=n:
            sub(x,y-1)
            if count>=3000:
                break
    if (n-1,n-1) in q:
        print("Yes")
    else:
        print("No")