import sequtils,strutils
var
    A = stdin.readline.split('.').map(parseInt)
    B = stdin.readline.split('.').map(parseInt)

block main:
    for i in 0..2:
        if A[i] < B[i]:
            echo "NO"
            break main
        elif A[i] > B[i]:
            echo "YES"
            break main
    echo "YES"