A. Odd/Even Strings
time limit per test
5 seconds
memory limit per test
1024 megabytes
input
standard input
output
standard output

Consider a string containing lowercase letters only. We call the string odd if every letter in the string appears an odd number of times. Similarly, we call the string even if every letter in the string appears an even number of times.

Given a string, determine if it is odd or even.

Input

There is only one input line; it contains a string of lowercase letters only. The string will contain $$$1$$$ to $$$60$$$ letters (inclusive).

Output

Print $$$0$$$ (zero) if the string is even, $$$1$$$ (one) if the string is odd, and $$$0/1$$$ (zero and one with a slash in between) if it is neither.

Examples
Input
geekkeeg
Output
0
Input
funnyn
Output
1
Input
zztop
Output
0/1