// 入力
// 3
// 1 2 0 0 0 0 0 0 0
// 出力
// 221


let n = Int(readLine()!)!
let counts = readLine()!.split(separator: " ").map { Int($0)! }

var str = ""

for num in 1...9 {
    let count = counts[num-1]
    let subStr = String(repeating: String(num), count: count)
    str = subStr + str
}

print(str)