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367 B

package main
import (
"fmt"
"os"
"strings"
)
func main() {
if len(os.Args) == 3 {
var res string
s1 := os.Args[1]
s2 := os.Args[2]
for _, v := range s1 {
if !strings.ContainsRune(res, v) {
res += string(v)
}
}
for _, v := range s2 {
if !strings.ContainsRune(res, v) {
res += string(v)
}
}
fmt.Print(res)
}
fmt.Println()
}