How to assign values to variables in sym function in matlab while finding out modulus?

While finding out modulus while dealing with very large numbers, i used the sym tool.

Usage of sym tool E.g:

a=5; b=2; 

c=sym('a^b');

mod(c,10)

ans= a^b mod 10

The answer should be clearly 5,but it does not pass values to the variables.

The sym tool is very necessary when the inputs are very high i.e a,b,c > 500.

Answer 1

[Walter Roberson]

c = subs(sym('a^b'));