def checkDigit(char):
    digits=['1','2','3','4','5','6','7','8','9']
    for j in range(len(digits)):
        if char==digits[j]:
            return char
    return None

def checkMaxDigitsSub(fileToCheck):
    with open(fileToCheck, "r", encoding="utf-8") as sampleCheck:
        word = ''
        previousChar=''
        for row in sampleCheck:
            for char in row:

                if char == '\n':
                    if word != '':
                        print(word)
                        word = ''

                if checkDigit(char):
                    if not checkDigit(previousChar):
                        word += ' '
                    word += char
                previousChar = char

file = 'simple.exp'
checkMaxDigitsSub(file)