test_cases = [
    ("764", 3),
    ("6274861", 14),
]

for test_num, (input_data, expected) in enumerate(test_cases, 1):
    f = open('INPUT.TXT', 'w')
    f.write(input_data)
    f.close()
    
    number = input_data
    number = number.replace('\n', '').replace('\r', '').replace(' ', '')
    
    n = len(number)
    max_sum = -999999999
    
    for skip in range(n):
        s = 0
        pos = 0
        for i in range(n):
            if i != skip:
                if pos % 2 == 0:
                    s = s + int(number[i])
                else:
                    s = s - int(number[i])
                pos = pos + 1
        if s > max_sum:
            max_sum = s
    
    result = max_sum
    status = "OK" if result == expected else "FAIL"
    print(f"Test {test_num}: input={input_data}, expected={expected}, got={result} - {status}")
    
    if result != expected:
        print(f"  Details for {input_data}:")
        for skip in range(n):
            new_num = number[:skip] + number[skip+1:]
            s = 0
            pos = 0
            for i in range(n):
                if i != skip:
                    if pos % 2 == 0:
                        s = s + int(number[i])
                    else:
                        s = s - int(number[i])
                    pos = pos + 1
            print(f"    Remove pos {skip} (digit '{number[skip]}'): {new_num} -> sum={s}")