luk.go

package main
// NOTE, THAT THIS PROGRAM HAS A BUG

import (
	"bufio"
	"fmt"
	"io"
	"log"
	"os"
	"unicode"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	for {
		r, size, err := reader.ReadRune()
		if err != nil {
			if err == io.EOF && size == 0 {
				break
			}
			log.Println("Error: ", err)
			continue
		}
		if unicode.IsUpper(r) {
			fmt.Print(string(r))
		}
	}
	fmt.Println()
}

NOTE, THAT THIS PROGRAM HAS A BUG