#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail
if [[ "${TRACE-0}" == "1" ]]; then
  set -o xtrace
fi

LINES=$(wc -l < "$1")
COLUMNS=140
mapfile -t -O 1 INPUT < "$1"
declare -a valid_numbers

find_numbers ()
{
  # Find and append valid numbers to array.
  for ((line=1; line<=LINES; line++)); do
    for ((column=1; column<=COLUMNS; column++)); do
      if [[ $(arr "${line}" $((column-1))) =~ ^[0-9]$ ]]; then
        continue # not start of number
      else
        local number='' length=0
        for ((i=column; ; i++)); do # find length
          if [[ $(arr "${line}" "${i}") =~ ^[0-9]$ ]]; then
            ((length++)) || true
          else
            break
          fi
        done
        [[ length -gt 0 ]] || continue # not a number
        for ((i=0; i<length; i++)); do # get number
          number+="$(arr "${line}" $((column+i)))"
        done
        declare -a to_check=("${line},$((column-1))" "${line},$((column+length))") # before and after
        for ((i=column-1; i<=column+length; i++)); do
          to_check+=("$((line-1)),${i}") # above
          to_check+=("$((line+1)),${i}") # below
        done
        for ((i=0; i<${#to_check[@]}; i++)); do
          if [[ $(arr "${to_check[i]%,*}" "${to_check[i]#*,}") =~ ^(\$|\*|/|=|\+|-|#|@|&|%)$ ]]; then
            valid_numbers+=("${number}")
            break
          fi
        done
      fi
    done
  done
}

arr ()
{
  # Usage: arr LINE COLUMN
  line="$1"
  column=$(($2-1))
  if ((line<=0)) || ((line>LINES)) || ((column<0)); then
    echo -n ''
  else
    echo -n "${INPUT[${line}]:${column}:1}"
  fi
}


main ()
{
  find_numbers
  sum=0
  for number in "${valid_numbers[@]}"; do
    sum=$((sum+number))
  done
  echo $sum
}

main