Arithmetic#4286
Misha is Stepan's younger brother who studies in the first grade. He is very inquisitive and constantly pesters Stepan with questions: And how much? And why? Today is not an exception. Misha caligraphically writes out the numbers in a row and asks: _How many different digits are in this number_. On the first examples Stepan quickly found the answer. But further Misha wrote larger numbers. This became a problem for Stepan.
Help Stepan - write a program that determines how many different digits are in Misha's number.
One integer (1 \le n \le 10^{1000}) written by Misha.
Print the number of different digits in the number.
Example 1