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 } // min for n entry func nmin(a ...int) int { ret := a[0] for _, e := range a { ret = min(ret, e) } return ret } // max for n entry func nmax(a ...int) int { ret := a[0] for _, e := range a { ret = max(ret, e) } return ret } 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 } // 先頭からの文字列と各文字から一致する文字列の長さを調べる // 戻り値は各文字からの一致文字数(0は文字列の長さと一致) func zalgo(str string) []int { n := len(str) a := make([]int, n) from, last := -1, -1 a[0] = n for i := 1; i < n; i++ { idx := a[i] if from != -1 { idx = min(a[i-from], last-i) idx = max(0, idx) } for idx+i < n && str[idx] == str[idx+i] { idx++ } a[i] = idx if last < i+idx { last = i + idx from = i } } return a } const mod = int(1e9 + 7) var memo [11000]int func rec(s string) int { if memo[len(s)] != 0 { return memo[len(s)] } ret := 1 for i := 1; i <= len(s)/2; i++ { // out(s[:i], s[len(s)-i:]) if s[:i] == s[len(s)-i:] { ret += rec(s[i : len(s)-i]) ret %= mod } } memo[len(s)] = ret return ret } 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() ans := rec(s) out(ans) }