import sys, re, string

pat = re.compile('[a-m]+')

print 'Upper-casing a-m.'
while 1:
    target = raw_input('Enter a target line ("q" to quit): ')
    if target == 'q':
        break
    result = pat.sub(
        lambda mo: string.upper(mo.group(0)),
        target)
    print 'result: %s' % result