fun main(args:Array<String>) {
    val isOlder = (1..2).map { readLine()!!.split(".").map { it.toInt() } }.let { a-> isOld(a[0], a[1]) }
    println(if(isOlder)"YES" else "NO")
}

fun isOld(arr1:List<Int>, arr2:List<Int>):Boolean {
    for((i,v) in arr1.withIndex()) {
        if(arr2[i] > v) {
            return false
        } else if(arr2[i] < v) {
            return true
        }
    }
    return true
}