package main import ( "bufio" "fmt" "os" "sort" "strconv" ) var sc = bufio.NewScanner(os.Stdin) var wr = bufio.NewWriter(os.Stdout) func out(x ...interface{}) { fmt.Fprintln(wr, x...) } func getI() int { sc.Scan() i, e := strconv.Atoi(sc.Text()) if e != nil { panic(e) } return i } func getF() float64 { sc.Scan() i, e := strconv.ParseFloat(sc.Text(), 64) if e != nil { panic(e) } return i } func getInts(N int) []int { ret := make([]int, N) for i := 0; i < N; i++ { ret[i] = getI() } return ret } func getS() string { sc.Scan() return sc.Text() } // min, max, asub, absなど基本関数 func max(a, b int) int { if a > b { return a } return b } func min(a, b int) int { if a < b { return a } return b } func asub(a, b int) int { if a > b { return a - b } return b - a } func abs(a int) int { if a >= 0 { return a } return -a } func lowerBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] >= x }) return idx } func upperBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] > x }) return idx } func check(hand []int) bool { r := 0 a := hand[0] b := hand[1] for i := 0; i < 7; i++ { r = a % 3 if b >= r && hand[i+2] >= r { a = b - r b = hand[i+2] - r } else { return false } } if a%3 == 0 && b%3 == 0 { return true } else { return false } } func main() { defer wr.Flush() sc.Split(bufio.ScanWords) sc.Buffer([]byte{}, 1000000) // this template is new version. // use getI(), getS(), getInts(), getF() s := getS() x := make([]int, 9) for i := 0; i < len(s); i++ { n := int(s[i]-'0') - 1 x[n]++ } for i := 0; i < 9; i++ { x[i]++ ok := true for j := 0; j < 9; j++ { if x[j] != 0 && x[j] != 2 { ok = false } } if ok == true { out(i + 1) return } x[i]-- } for j := 0; j < 9; j++ { if x[j] == 4 { continue } x[j]++ // out("=====") // out(x) // out("-----") for k := 0; k < 9; k++ { if x[k] >= 2 { x[k] -= 2 // out(x) if check(x) { out(j + 1) x[k] += 2 break } x[k] += 2 } } x[j]-- } }