#import <iostream>
#include <fstream>
#include <cstring>
using namespace std;
void increment(char number[])
{
/** Increments a number given as string.
*
* @param number: the number to be incremented
*/
int current_position = 1;
while (number[strlen(number) - current_position] == '9')
{
number[strlen(number) - current_position] = '0';
current_position++;
}
number[strlen(number) - current_position]++;
}
/** The function checks if a given number is "balanced". A number is "balanced" if the sum of the digits with odd indexes
* is equal to the sum of the digits with even indexes.
*
* @param number: string containing the number to be checked.
* @return: true if the number is balanced, false otherwise.
*/
bool is_balanced(char number[])
{
int sum_odd = 0, sum_even = 0;
for (int index = 0; index < strlen(number); index += 2)
{
sum_even += number[index];
}
for (int index = 1; index < strlen(number); index += 2)
{
sum_odd += number[index];
}
return sum_even == sum_odd;
}
int main()
{
ifstream fin("ech.in");
ofstream fout("ech.out");
char number[23];
fin.getline(number, sizeof(number));
increment(number);
while(!is_balanced(number))
increment(number);
fout << number;
return 0;
}
