package main import ( "bufio" "fmt" "os" "sort" "strconv" ) func out(x ...interface{}) { fmt.Println(x...) } var sc = bufio.NewScanner(os.Stdin) func getInt() int { sc.Scan() i, e := strconv.Atoi(sc.Text()) if e != nil { panic(e) } return i } func getInts(N int) []int { ret := make([]int, N) for i := 0; i < N; i++ { ret[i] = getInt() } return ret } func getString() 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 main() { sc.Split(bufio.ScanWords) N := getInt() s := make([][]string, N) for i := 0; i < N; i++ { s[i] = make([]string, N) for j := 0; j < N; j++ { s[i][j] = getString() } } cnt := make([]int, N) for i := 0; i < N; i++ { for j := 0; j < N; j++ { if s[i][j] == "nyanpass" { cnt[j]++ } } } pos := -1 for i := 0; i < N; i++ { if cnt[i] == N-1 { if pos == -1 { pos = i } else { out(-1) return } } } if pos != -1 { out(pos + 1) return } out(-1) }