num = int(input())
def check_num(number):
check = number+1
while True:
str_check = str(check)
if str_check == ''.join(str_check[::-1]):
return str_check
else:
check+=1
print(check_num(num))
print("\nThe proper answer [Output, stdout] is:\n\n818\n2222\n\n not 3, honey! ;-)")
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