#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# file = "./ex.txt"
file = "./input.txt"

if __name__ == "__main__":
    solution = 0
    positions = []
    input_file = open(file, "r")
    for line in input_file:
        line = line.strip()
        if line == "":
            continue
        else:
            a,b = line.split(',')
            a = int(a)
            b = int(b)
            positions.append([a,b])

    for i in range(len(positions)):
        for j in range(i+1, len(positions)):
            area = (abs(positions[i][0]-positions[j][0])+1)*(abs(positions[i][1]-positions[j][1])+1)
            if area > solution:
                solution = area
    print(f"Solution: {solution}")