#include <iostream>
#include <algorithm>
int min_fmt(std::string s) {
if (s.length() > 1) {
int mn = -1u >> 1;
char temp;
for (size_t i = 0; i < s.length(); ++i) {
temp = s[i];
s.erase(i, 1);
mn = std::min(mn, atoi(s.c_str()));
s.insert(i, 1, temp);
}
return mn;
}
return s.length() ? s[0] - '0' : 0;
}
int main() {
std::string n;
std::cin >> n;
std::cout << min_fmt(n);
}
