Problem:
You are given an H × W grid.   The squares in the grid are described by H strings, S_1,...,S_H.   The j-th character in the string S_i corresponds to the square at the i-th row from the top and j-th column from the left (1 \leq i \leq H,1 \leq j \leq W).   `.` stands for an empty square, and `#` stands for a square containing a bomb.  Dolphin is interested in how many bomb squares are horizontally, vertically or diagonally adjacent to each empty square.   (Below, we will simply say "adjacent" for this meaning. For each square, there are at most eight adjacent squares.)   He decides to replace each `.` in our H strings with a digit that represents the number of bomb squares adjacent to the corresponding empty square.  Print the strings after the process.

Incorrect submission (verdict: Wrong Answer):
import sys


def main():

    # Get Args
    args = _input_args()  # get arguments as an array from console/script parameters.

    # Call main Logic
    result = _main(args)

    # Output a result in a correct way.
    _output_result(result)


def _main(args):
    """Write Main Logic here for the contest.

    :param args: arguments
    :type args: list
    :return: result
    :rtype: depends on your logic.
    """
    # Extract arguments.
    lines = args
    H, W = int(lines[0].split()[0]), int(lines[0].split()[1])
    field_map = get_field_map(lines[1:])
    result_map = [[0 for col in range(W)] for row in range(H)]

    for h in range(H):
        for w in range(W):
            result_map[h][w] = sweep_perimeters(h, w, field_map, H, W)

    result_lines = convert_map_to_lines(result_map)

    # Return something.
    return result_lines


def sweep_perimeters(h, w, field_map, H, W):
    found_mine = 0

    if field_map[h][w] == '#':
        return '#'

    for i in range(h-1, h+1+1):
        for j in range(w-1, w+1+1):
            if (0 <= i <= H-1) and (0 <= j <= W-1):
                target = field_map[i][j]
                print(target)
                if target == '#':
                    found_mine += 1

    return found_mine


def get_field_map(lines):
    field_maps = []
    for line in lines:
        elements = list(line)
        field_maps.append(elements)
    return field_maps


def convert_map_to_lines(result_map):
    result_lines = []
    for row_array in result_map:
        stringfied_row = ''
        for value in row_array:
            value = str(value)
            stringfied_row += value
        result_lines.append(stringfied_row)

    return result_lines

def _input_args():
    # Comment-out appropriate pattern depends on subject.

    # arguments = sys.argv[1:]  # ptn1: get args from script parameters.
    # arguments = _input().split()  # ptn2: get args from 1 line console prompt with space separated.

    # for multi-line console input, use this.
    arguments = _get_args_from_multiple_lines(end_of_lines_char=[''], limit=10000000)

    # Cast elements If you need.
    # arguments = list(map(int, arguments))  # cast elements to int for example.

    return arguments  # This will be array.


def _input():
    # If Subject requires interactive input, use this and patch mock in unittest.
    return input()  


def _get_args_from_multiple_lines(end_of_lines_char=[''], limit=10000000):
    """Get arguments from multiple lines standard input.

    :param end_of_lines_char: Strings that indicate the end of lines.
    :type end_of_lines_char: list of str
    :param limit: If a number of the input line are certain, you can use this param to close prompt immediately.
    :type limit: int
    :return: args
    :rtype list of str
    """
    args = []
    for i in range(limit):
        try:
            arg = _input()
            if arg in end_of_lines_char:
                break
            args.append(arg)
        except EOFError:  # Supports EOF Style. (Very Rare case)
            break
    return args


def _output_result(result):
    # Comment-out appropriate output pattern depends on subject.

    for line in result:
        print('{}'.format(str(line)))  # Same as above, but more versatile.


if __name__ == '__main__':
    main()


Fixed, accepted submission:
import sys


def main():

    # Get Args
    args = _input_args()  # get arguments as an array from console/script parameters.

    # Call main Logic
    result = _main(args)

    # Output a result in a correct way.
    _output_result(result)


def _main(args):
    """Write Main Logic here for the contest.

    :param args: arguments
    :type args: list
    :return: result
    :rtype: depends on your logic.
    """
    # Extract arguments.
    lines = args
    H, W = int(lines[0].split()[0]), int(lines[0].split()[1])
    field_map = get_field_map(lines[1:])
    result_map = [[0 for col in range(W)] for row in range(H)]

    for h in range(H):
        for w in range(W):
            result_map[h][w] = sweep_perimeters(h, w, field_map, H, W)

    result_lines = convert_map_to_lines(result_map)

    # Return something.
    return result_lines


def sweep_perimeters(h, w, field_map, H, W):
    found_mine = 0

    if field_map[h][w] == '#':
        return '#'

    for i in range(h-1, h+1+1):
        for j in range(w-1, w+1+1):
            if (0 <= i < H) and (0 <= j < W):
                target = field_map[i][j]
                if target == '#':
                    found_mine += 1

    return found_mine


def get_field_map(lines):
    field_maps = []
    for line in lines:
        elements = list(line)
        field_maps.append(elements)
    return field_maps


def convert_map_to_lines(result_map):
    result_lines = []
    for row_array in result_map:
        stringfied_row = ''
        for value in row_array:
            value = str(value)
            stringfied_row += value
        result_lines.append(stringfied_row)

    return result_lines

def _input_args():
    # Comment-out appropriate pattern depends on subject.

    # arguments = sys.argv[1:]  # ptn1: get args from script parameters.
    # arguments = _input().split()  # ptn2: get args from 1 line console prompt with space separated.

    # for multi-line console input, use this.
    arguments = _get_args_from_multiple_lines(end_of_lines_char=[''], limit=10000000)

    # Cast elements If you need.
    # arguments = list(map(int, arguments))  # cast elements to int for example.

    return arguments  # This will be array.


def _input():
    # If Subject requires interactive input, use this and patch mock in unittest.
    return input()  


def _get_args_from_multiple_lines(end_of_lines_char=[''], limit=10000000):
    """Get arguments from multiple lines standard input.

    :param end_of_lines_char: Strings that indicate the end of lines.
    :type end_of_lines_char: list of str
    :param limit: If a number of the input line are certain, you can use this param to close prompt immediately.
    :type limit: int
    :return: args
    :rtype list of str
    """
    args = []
    for i in range(limit):
        try:
            arg = _input()
            if arg in end_of_lines_char:
                break
            args.append(arg)
        except EOFError:  # Supports EOF Style. (Very Rare case)
            break
    return args


def _output_result(result):
    # Comment-out appropriate output pattern depends on subject.

    for line in result:
        print('{}'.format(str(line)))  # Same as above, but more versatile.


if __name__ == '__main__':
    main()