Arania Exumai Blast !! Hacker Earth Solution in C

 https://www.hackerearth.com/practice/basic-programming/implementation/basics-of-implementation/practice-problems/algorithm/reflection-is-every-thing-2fff0566/submissions/

#include <stdio.h>

int main()

{

    char str[10001];

gets(str);

    int c=0,i;

for(i=1;str[i] != '\0'; i++)

        if(str[i] == str[i-1])

            c++;

    printf("%d",c);

}