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#include <algds/sort.h>
#include <errno.h>
#include <ctype.h>
#include <algds/vec.h>
#include <algds/str.h>
#include <stdio.h>
typedef struct {
int x;
int y;
} Vec2;
long rec_area(Vec2 a, Vec2 b) {
long dx = a.x - b.x;
long dy = a.y - b.y;
if (dx < 0) dx = -dx;
if (dy < 0) dy = -dy;
return (dx + 1) * (dy + 1);
}
#define PANIC do { \
fprintf(stderr, "panic at %s:%d\n", __FILE__, __LINE__); \
abort(); \
} while (0)
void expect_char(char e) {
int c = fpeek(stdin);
if (c != e) {
PANIC;
}
fgetc(stdin);
}
bool string2long(const char *s, long *num) {
char *end;
errno = 0;
*num = strtol(s, &end, 10);
if (end == s) {
return false;
}
if (errno != 0) {
return false;
}
return true;
}
int64_t parse_integer() {
long ret;
StrBuilder sb;
StrBuilder_init(&sb);
while (1) {
int c = fpeek(stdin);
if (isdigit(c)) {
fgetc(stdin);
StrBuilder_append_char(&sb, c);
} else {
break;
}
}
if (strlen(sb.buf) == 0) {
PANIC;
}
StrBuilder_append_char(&sb, '\0');
if (!string2long(sb.buf, &ret)) {
PANIC;
}
free(sb.buf);
return ret;
}
Vec2 parse_vec2() {
int x = parse_integer();
expect_char(',');
int y = parse_integer();
return (Vec2){.x = x, .y = y};
}
void Vec2_show(Vec2 self, FILE *fp) {
fprintf(fp, "(%d,%d)", self.x, self.y);
}
VECTOR_DEF(Vec2)
VECTOR_IMPL(Vec2)
int main() {
Vec2Vector tiles;
Vec2Vector_init(&tiles);
while (1) {
int c = fpeek(stdin);
if (!isdigit(c)) {
break;
}
Vec2 v = parse_vec2();
c = fpeek(stdin);
if (c == '\n') {
fgetc(stdin);
}
Vec2Vector_push_back(&tiles, v);
}
long max_area = 0;
for (int i = 0; i < tiles.size; i++) {
for (int j = i + 1; j < tiles.size; j++) {
long area = rec_area(tiles.buffer[i], tiles.buffer[j]);
if (area > max_area) {
max_area = area;
}
}
}
printf("%ld\n", max_area);
return 0;
}
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