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package main
//
// See ../README.md
//
//
// Run as: go run ch-2.go
//
import (
"fmt"
"bufio"
"os"
"strings"
"regexp"
)
func main () {
var reader = bufio . NewReader (os. Stdin)
var w = [] rune {1, 3, 1, 7, 3, 9, 1}
for {
var text, err = reader . ReadString ('\n')
if (err != nil) {
break
}
//
// Remove trailing newline
//
text = strings . TrimRight (text, "\n")
//
// Syntax check
//
match, _ := regexp . MatchString (
"^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}[0-9]$", text)
if !match {
fmt . Print ("0\n")
continue
}
//
// Check sum
//
var check rune = 0
for i, rune := range text {
if rune <= '9' {
rune -= '0'
} else {
rune -= 'A'
}
check += w [i] * rune
}
if check % 10 == 0 {
fmt . Print ("1\n")
} else {
fmt . Print ("0\n")
}
}
}
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