遍历两个字符串即可

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    bs := bufio.NewScanner(os.Stdin)
    before := ""
    after := ""
    for bs.Scan() {
        input := bs.Text()
        if before == "" {
            before = input
            continue
        }
        after = input
        for _, i := range before {
            flag := false
            for _, j := range after {
                if i == j {
                    flag = true
                    break
                }
            }
            if !flag {
                fmt.Println(false)
                goto loop
            }
        }
        fmt.Println(true)
    loop:
        before = ""
        after = ""
    }
}