#!/usr/bin/env python3
import sys
import pdb
from collections import defaultdict

grid = defaultdict(lambda: defaultdict(int))

def bigrange(a, b):
    # NOTE: unlike a.py, reversed is impt!
    if a > b:
        return reversed(range(b, a + 1))
    else:
        return range(a, b + 1)

for l in sys.stdin:
    a, arrow, b = l.split()
    x1, y1 = [int(x) for x in a.split(',')]
    x2, y2 = [int(x) for x in b.split(',')]
    if x1 == x2:
        for y in bigrange(y1, y2):
            grid[x1][y] += 1
    elif y1 == y2:
        for x in bigrange(x1, x2):
            grid[x][y1] += 1
    else:
        xr = bigrange(x1, x2)
        yr = bigrange(y1, y2)
        coords = zip(xr, yr)
        for x, y in coords:
            grid[x][y] += 1
        
count = 0
for x in grid.keys():
    for y in grid[x].keys():
        if grid[x][y] > 1:
            count += 1

print(count)