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242 B

package main
import (
"fmt"
"os"
"strings"
)
func main() {
if len(os.Args) == 4 {
fmt.Println(strings.Map(func(r rune) rune {
if r == []rune(os.Args[2])[0] {
return []rune(os.Args[3])[0]
}
return r
}, os.Args[1]))
}
}