acme/bin/t2s

#!/usr/bin/env python3

import sys

DEFAULT_N_SPACES = 4
TAB, SPACE = '	', ' '

try:
    n_spaces = int(sys.argv[1])
except:
    n_spaces = DEFAULT_N_SPACES

if n_spaces < 1:
    n_spaces = DEFAULT_N_SPACES

for line in sys.stdin:
    line = line.rstrip()
    n_tabs = 0

    for ch in line:
        if ch != TAB:
            break
        n_tabs += 1

    spaces = SPACE * n_spaces * n_tabs
    print(spaces, line[n_tabs:], sep='')