def apply_to_digits(some_str,handler):
    sign = "+"
    started = 0
    number = []
    tmp = []
    result = []
    for idx,char in enumerate(some_str):
        if started:
            if not char.isdigit():
                if number:
                    ss = sign + "".join(number)
                    rewritten = str(handler(int(ss)))
                    result.append(rewritten)
                elif tmp:
                    result.append("".join(tmp))
                number = []
                tmp = []
                sign = "+"
                started = 0
                # char will be dealt later
            else:
                number.append(char)
                continue
        if char in "-+":
            sign = char
            started = 1
            if tmp:
                result.append("".join(tmp))
                tmp = []
            tmp.append(char)
            continue
        elif char.isdigit():
            started = 1
            if tmp:
                result.append("".join(tmp))
                tmp = []
            number.append(char)
        else:
            tmp.append(char)
    if number:
        ss = sign + "".join(number)
        rewritten = str(handler(int(ss)))
        result.append(rewritten)
    if tmp:
        result.append("".join(tmp)), tmp
    return "".join(result)
#