let inpA = readLine()!
let inpB = readLine()!
let oldVers = inpA.split(separator: ".").map{Int($0)!}
let curVers = inpB.split(separator: ".").map{Int($0)!}
let oneThousandMillion = [1000000,1000,1]

var oldVer = 0
var curVer = 0

for i in 0 ... 2 {
    oldVer += (oldVers[i] * oneThousandMillion[i])
    curVer += (curVers[i] * oneThousandMillion[i])
}

print(curVer < oldVer ? "YES" : "NO")