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

void main()
{
    auto line = readln().strip();
    int maxn = line.dup().map!(to!int).reduce!max;
    long max = 0;
    ulong left = 0;
    foreach(i; 0..line.length) {
        if (line[i].to!int != maxn) {
            left = i;
            break;
        }
    }
    foreach(idx; 0..line.length) {
        if (line[idx].to!int != maxn) continue;
        dchar[] l = line.dup.to!(dchar[]);
        auto tmp = l[left];
        l[left] = l[idx];
        l[idx] = tmp;
        auto n = l.to!long;
        if (n > max) {
            max = n;
        }
    }
    writeln(max);
}