#! /usr/bin/python
# KeyCracker1c by Mike Sweeney (mjs) 10-may-05 (30 lines)
import sys
from string import *
f = [strip(a) for a in file(sys.argv[1]).readlines() if strip(a)]
src, dest = f[:len(f)/2], f[len(f)/2:]
out, incol = [], 0
for r in range( len(src) ):
	s,d = src[r], dest[r]; cmd = ''
	for i in range( max(len(s),len(d))+1 ):
		if i >= len(d) and i >= len(s): cmd = ''
		elif i >= len(d): cmd += '>'
		elif i >= len(s): cmd = 'ea%s' % d[i:]
		elif s[i] != d[i]: cmd += '>a%s' % d[i:]
		else: cmd += 'r'; continue
		break
	nr = 0
	while cmd[nr:nr+1] == 'r' : nr += 1
	incol = min( incol, len(s)-1 )
	if cmd == '' : pass
	elif nr != 0 and incol-nr <= nr : cmd = 'l'*(incol-nr)+cmd[min(incol,nr):]
	elif incol >= len(s)-1:
		if cmd[0:1] == 'e' : cmd = cmd[1:]
		elif cmd[0:1] == '>' : cmd = '<'+cmd[1:]
		else : cmd = 'b'+cmd
	elif incol != 0 : cmd = 'b'+cmd
	if dest[r+1:r+2]: cmd += 'd'
	out.append( cmd )
	if cmd != 'd' : incol = len(d)-1
print join(out,'')