import std.stdio, std.algorithm, std.conv, std.array, std.string;

void main()
{
    auto line = readln().strip();
    string ans = line;
    for (int i = 0; i < line.length - 1; ++i) {
        for (int j = i + 1; j < line.length; ++j) {
            char[] s = line.to!(char[]);
            auto tmp = s[i];
            s[i] = s[j];
            s[j] = tmp;
            if (ans < s.to!string) ans = s.to!string;
        }
    }
    writeln(ans);
}