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318 B

package main
import (
"fmt"
"os"
"unicode"
)
func main() {
if len(os.Args) == 2 {
runes := []rune(os.Args[1])
for i, r := range runes {
if unicode.IsLower(r) {
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runes[i] = unicode.ToUpper(r)
} else if unicode.IsUpper(r) {
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runes[i] = unicode.ToLower(r)
}
}
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fmt.Println(string(runes))
}
}