Numbers - Range Count

Given N distinct integers, the program must print the number of ranges R present. A range is defined as two or more consecutive integers.

Input Format:
The first line contains N.
The second line contains N integer values separated by a space.

Output Format:
The first line contains R.

Boundary Conditions:
2 <= N <= 100000
1 <= R <= 10000

Example Input/Output 1:
Input:
5
2 1 4 9 3

Output:
1

Explanation:
The only range which is present is 1 2 3 4.
9 is not a range (as a range needs two or more consecutive integers).

Example Input/Output 2:
Input:
7
1 3 11 -15 -20 9 5

Output:
0

Python code:

n=int(input())

a=list(map(int,input().split()))

a.sort()

c=1;l=[]

for i in range(len(a)-1):

         if a[i]+1==a[i+1]:

                 c+=1

         else:    

               l.append(c)    

                c=1

l.append(c)

print(sum(i>1 for i in l))