#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>using namespace std;char st[15];int com(int n, int r){ if (n - r < r) r = n - r; int i, j, s = 1; for (i = 0, j = 1; i < r; ++i) { s *= (n - i); for (; j <= r && s % j == 0; ++j) s /= j; } return s;}int main(){ //freopen("t.txt", "r", stdin); gets(st); int len = strlen(st); if (len == 1) { printf("%dn", st[0] - 'a' + 1); return 0; } bool ok = true; if (st[0] <= 'z' && st[0] >= 'a') ok = true; else ok = false; for (int i = 1; i < len; i++) if (!(st[i] <= 'z' && st[i] >= 'a' && st[i] > st[i - 1])) ok = false; if (!ok) { printf("0n"); return 0; } int ans = 26; for (int i = 2; i < len; i++) ans += com(26, i); ans += com(26, len) - com(26 - (st[0] - 'a'), len); for (int i = 1; i < len; i++) ans += com(26 - (st[i - 1] - 'a' + 1), len - i) - com(26 - (st[i] - 'a' ), len - i); printf("%dn", ans + 1); return 0;}
