package main

import (
    "fmt"
)

func reverse(s string) string {
    s1 := []rune(s)
    for i := 0; i < len(s1)/2; i++ {
        tmp := s1[i]
        s1[i] = s1[len(s1)-1-i]
        s1[len(s1)-1-i] = tmp
    }
    return string(s1)
}

func main() {
    s := "123456"
    fmt.Println(reverse(s))
}

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