#include<vector>
#include<iostream>
#include<queue>
using namespace std;class Solution {
public:
vector<string> path_;
vector<vector<string>> res_;vector<vector<string>> partition(string s) {bt(s, 0);return res_;}// 11:10void bt(const string& s, int start_idx) {if (start_idx >= s.size()) { res_.push_back(path_);return; // 写不写return都可以，因为下面是bt(s,i+1)，不会无限循环}for (int i = start_idx; i < s.size(); i++) {string sub_s = s.substr(start_idx, i - start_idx + 1);if (valid(sub_s)) {path_.push_back(sub_s);bt(s, i + 1); // bug， i+1又写成了start_idx!!好几道题都是这里出错的path_.pop_back();}}}bool valid(const string& str) {if (str.size() == 1) {return true;}int s = 0;int e = str.size() - 1;while(s < e) {if (str[s++] != str[e--]) {return false;}}return true;}
};int main() {Solution s;auto res = s.partition("aab");for (auto vs : res) {for (auto s: vs) {std::cout<<s<<" ";}std::cout<<endl;}
}

#include <iostream>
#include <vector>
#include <string>
using namespace std;class Solution {
public:
vector<string> path_;
vector<vector<string>> res_;int f(int num) {string num_str = to_string(num);bt(num_str, 0);return res_.size();
}
void bt(const string& num_str, int start_idx){if (start_idx >= num_str.size()) {res_.push_back(path_);return;}for (int i = start_idx; i < num_str.size(); i++) {auto sub_str = num_str.substr(start_idx, i - start_idx + 1);if (sub_str.size() <=2 && stoi(sub_str) <=26 && stoi(sub_str) >=0) { // 只有这里的valid条件和上面的不一样，其他都一样。path_.push_back(sub_str);bt(num_str, i + 1);path_.pop_back();}}
}
};int main() {Solution s;int a, b;while (cin >> a) { // 注意 while 处理多个 casecout << s.f(a) << endl;}}
// 64 位输出请用 printf("%lld")