gorodnev

import collections
genome = 'aaaabbcaa'
result = collections.deque()
genome += '$'
last = genome[0]
counter = 1
for c in genome[1:]:
  if c == last:
    counter += 1
  else:
    result.append('%s%d' % (last, counter))
    last = c
    counter = 1
print(''.join(result))

handlers = {
  'ADD': lambda x: print('ADD with %s' % x),
  'DELETE': lambda x: print('DELETE with %s' % x),
  'INSERT': lambda x: print('INSERT with %s' % x)
  }
for _ in range(int(input())):
  handler_name, arg = input().split()
  handler = handlers.get(
        handler_name, lambda _: print("%s wasn't found" % handler_name)
        )
  handler(arg)

% cat input.txt 
4
DELETE 10
INSERT 2
ADD 15
SELECT 7

% python3 ans.py < input.txt             
DELETE with 10
INSERT with 2
ADD with 15
SELECT wasn't found