############################
## 3. prednaska            #
## stringy, prace s textem #
############################

text="""
to mame dneska pekny den.
byla by skoda nejit ven.
"""

slovnik=(
	("to", "ono"),
	("mame", "nemame"),
	("byla", "nebyla")
);

for i in slovnik:
	newtext=text.replace(i[0],i[1])
	text=newtext

print text