Line Filters

import (

    "bufio"

    "fmt"

    "os"

    "strings"

)

func main() {

    scanner := bufio.NewScanner(os.Stdin)

    for scanner.Scan() {

        ucl := strings.ToUpper(scanner.Text())

        fmt.Println(ucl)

    }

    if err := scanner.Err(); err != nil {

        fmt.Fprintln(os.Stderr, "error:", err)

        os.Exit(1)

    }

}