from collections import defaultdict,deque
import sys,heapq,bisect,math,itertools,string,queue,datetime
sys.setrecursionlimit(10**8)
INF = float('inf')
mod = 10**9+7
eps = 10**-7
def inpl(): return list(map(int, input().split()))
def inpls(): return list(input().split())

H,W = inpl()
sss = [input() for i in range(H)]

for ss in sss:
    if 'LOVE' in ss:
        print('YES')
        sys.exit()

print('NO')