#include <iostream>
using namespace std;
bool doua_cifre (int t) {
if (t / 10 == 0) return false;
return true;
}
bool mai_mare(int t, int u) {
if(t % 10 == u % 10) return t > u;
return t % 10 > u % 10;
}
int main () {
int c[100], m, v[100], s = 0, citire[100], max_c = 0, key;
bool egale = false;
for (int i = 0; i < 100; ++ i) {
c[i] = 0;
}
cin >> m;
while (!egale) {
egale = true;
for (int i = 0; i < m; ++ i) {
int j;
cin >> j;
citire[i] = j;
if (doua_cifre(j)) ++c[j];
}
int verif = citire [0];
for (int i = 1; i < m; ++ i) {
if (verif != citire[i]) egale = false;
}
}
for (int i = 10; i < 100; ++i) {
if (c[i] > max_c) {
max_c = c[i];
}
}
for (int i = 10; i < 100; ++i) {
if (c[i] == max_c) {
v[s] = i;
s++;
}
}
key = v[0];
while (s > 1) {
--s;
if (mai_mare(c[s], key)) key = c[s];
}
cout << key;
return 0;
}
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