p = list(map(int,input().split(".")))
q = list(map(int,input().split(".")))
counter = 0
for i in range(3) :
    if p[i] == q[i] :
        counter += 1
    elif p[i] > q[i] :
        print("YES")
        break
    else :
        print("NO")
        break
if counter == 3 :
    print("YES")