let n = Array(readLine()!).map{String($0)}
var c = n.count % 3
var s = ""

for (j,i) in n.enumerated(){
    s += i
    c -= 1
    if c == 0{
        print(j)
        s += ","
        c = 3
    }
}
print(s.prefix(s.count - 1))