string miniNum(string s) {
vector<int> dp(10, 0);
for (int i = 0; i < s.size(); i++) {
dp[s[i] - '0']++;
}
int index = min_element(dp.begin() + 1, dp.end()) - dp.begin();
return (*dp.begin() + 1 <= dp[index])
? ("1" + string(dp[0] + 1, '0'))
: (string(dp[index] + 1, index + '0'));
}
