a.txt

1. Find frequency of characters in a string given
	print the top 3 frequent occuring character and their occurance count
	
For Exemple: 
input "aabbbccccddd"

output
	c 4
	b 3
	d 3
	
2. You have been given a number 'x', Find next nearest number which is divisible by 'n'

Exemple: 
input x=13, n =5
output 15

Exemple: 
input x=23, n =10
output 30


3. You have been given number 'n', find the square root of 'n' without using any predefined function.