import Foundation

let o=readLine()!
let e=readLine()!

var res=""

for i in 0..<max(o.count, e.count){
    res+=String(o[o.index(o.startIndex, offsetBy: i)])
    if i<e.count{
        res+=String(e[e.index(e.startIndex, offsetBy: i)])
    }
}

print(res)
