#Caesar code
#L1 = ['a','e'] # + swap 'find' for 'index'
L1 = 'aeiou'
print (' introdu')
MESS = input ()
for LETTER in MESS:
NEWPOS = L1.find(LETTER)+1 #find the position in L1, +1
if NEWPOS == 0 :
print ('\nthe letter ' + LETTER+ ' is not included so i stop')
break #quit() if you want to kill it
elif NEWPOS >= len(L1):
NEWPOS = 0 #solving last item +1 error
#print (L1.find(LETTER)) #Finds the position of the item in a list
print (L1[NEWPOS], end = '') #cancels the default print-newline