02. Password

package main

import "fmt"

func main() {
    var username, password string
    fmt.Scanln(&username)
    fmt.Scanln(&password)

    var input = ""

    for ;; {
        fmt.Scanln(&input)
        if input == password {
            fmt.Println("Welcome " + username + "!")
            break
        }
    }
}

ИЛИ:

package main

import "fmt"

func main() {
    var username, password string
    fmt.Scanln(&username)
    fmt.Scanln(&password)

    var input string
    fmt.Scanln(&input)

    for i := 0 ; input != password; i++ {
        fmt.Scanln(&input)
    }

    fmt.Println("Welcome " + username + "!")
}