import re

SYMBOLS = ['#', '$', '%', '&', '*', '+', '-', '/', '=', '@']

find_number = re.compile(r'\d+')

with open('adv03a.txt') as f:
    txt = [l for l in f.readlines() if l]
sym = [[c in SYMBOLS for c in l] for l in txt]
matches = [list(find_number.finditer(l)) for l in txt]

def num(match):
    #print(match.group(0))
    return int(match.group(0))

total = 0
for linenum in range(len(matches)):
    for match in matches[linenum]:
        has_left = match.start() > 0
        has_right = match.end() < len(txt[linenum])
        has_up = linenum > 0
        has_down = linenum < len(matches) - 1
        if has_up:
            if any(sym[linenum-1][match.start():match.end()]):
                total += num(match)
                continue
            if has_left:
                if sym[linenum-1][match.start()-1]:
                    total += num(match)
                    continue
            if has_right:
                if sym[linenum-1][match.end()]:
                    total += num(match)
                    continue
        if has_down:
            if any(sym[linenum+1][match.start():match.end()]):
                total += num(match)
                continue
            if has_left:
                if sym[linenum+1][match.start()-1]:
                    total += num(match)
                    continue
            if has_right:
                if sym[linenum+1][match.end()]:
                    total += num(match)
                    continue
        if has_left:
            if sym[linenum][match.start()-1]:
                total += num(match)
                continue
        if has_right:
            num(match)
            if sym[linenum][match.end()]:
                total += num(match)
                continue

print(total)