argtype: 4
format: '%c%s'
  4 < 2>: a, 'braham'
  4 < 2>: a, 'braham'
format: '%1s%s'
  4 < 2>: a, 'braham'
format: '%[aeiouA-Z]%s'
  4 < 2>: a, 'braham'
  4 < 2>: C, 'ALVIN'
  4 < 2>: i, 'rving'
finished