help-the-friends-of-roger-1

Roger the Lion wants to help all his friends with passing exams. They need to solve the following problem to pass the IT exam.

You've got string s = s1s2... sn (n is the length of the string), consisting only of characters "." and "#" and m queries. Each query is described by a pair of integers li, ri (1 ≤ li < ri ≤ n). The answer to the query li, ri is the number of such integers i (li ≤ i < ri), that si = si + 1.

Roger the Lion wants to help his friends but is there anyone to help him? Help Roger, solve the problem.

Input
The first line contains string s of length n (2 ≤ n ≤ 105). It is guaranteed that the given string only consists of characters "." and "#".
The next line contains integer m (1 ≤ m ≤ 105) — the number of queries. Each of the next m lines contains the description of the corresponding query. The i-th line contains integers li, ri (1 ≤ li < ri ≤ n).

Output
Print m integers — the answers to the queries in the order in which they are given in the input.

SAMPLE INPUT
......
4
3 4
2 3
1 6
2 6

SAMPLE OUTPUT
1
1
5
4

Source: hackerearth | Difficulty: UNKNOWN_DIFFICULTY


Solutions:
word = input()
n = int(input())
for i in range(n):
	ans = 0
	l,r = list(map(int, input().split()))
	for j in range(l,r):
		if word[j-1] == word[j]:
			ans+=1
	print(ans)


x=input()
for i in range(eval(input())):
	L,R=list(map(int,input().split()))
	if(x.count(".")==len(x) or x.count("#")==len(x)):
		print(R-L)
	else:
		ans=0
		for i in range(L-1,R-1):
			if(x[i]==x[i+1]):
				ans+=1
		print(ans)