#read number of transactions
n=int(input().strip())
#reading existing transaction ammounts
transactions=list(map(float,input().strip().split()))
#reading new transaction ammount
new_transaction=float(input().strip())
#check number of inputs matches n
if len (transactions)!=n:
print("invalid input")
else
#append new transaction
transactions append(new_transaction)
#print updated list
print"".join(map(str,transactions)))
except valueerror:
#if non-numeric input found
print("invalid input")