import std.stdio;
import std.array;
import std.string;
import std.conv;
import std.math;

void main() {
    int n = to!int(chomp(readln()));

    int[ulong] counter;
    foreach (i; 0..n) {
        counter[chomp(readln()).length - 2]++;
    }

    int ans = -1;
    foreach (k; counter.keys()) {
        if (ans < 0 || counter[k] > counter[ans] ||
                (counter[k] == counter[ans] && k > ans)) {
            ans = to!int(k);
        }
    }
    writeln(ans);
}