text: ﻿Check Repeated Alphabets
  The program must accept a string value S as the input. The program must print invalid if the alphabets are repeated continuously for more than two times. Else the program must print valid as the output.
  Boundary Condition(s):
  3 <= Length of S <= 100
  Input Format:
  The first line contains the values of string S.
  Output Format:
  The first line contains either invalid or valid.
  Example Input/Output 1:
  Input:
  dreaaam
  Output:
  invalid
  Explanation:
  In dreaaam, a is repeated more than two times continuously.
  Hence the output is invalid
  Example Input/Output 2:
  Input:
  skillrack
  Output:
  valid
  #include<stdio.h>
  #include <stdlib.h>
  
  int main()
  {
      char s[100];
      int i,repeat=0;
      scanf("%s",s);
      for(i=0;s[i]!=NULL;i++)
      {
          if(s[i]==s[i+1]&&s[i]==s[i+2])
          {
              repeat++;
          }
      }
      if(repeat==0)
      {
          printf("valid");
      }
      else
      {
          printf("invalid");
      }
         
  }
  