#include <stdio.h>

int main()
{
    char a[80], com[80],buff[80];
    printf("enter the string\n");
    scanf("%[^\n]s", a);
    com[0] = 'o';
    com[1] ='\0';
    int i,j,n;
    char last = a[0];
    for (i = 1;a[i] != '\0';i++)
    {
        if(last == a[i])
        {
            buff[0] = a[i];
            buff[1] = a[i];
            for(j=2;a[i-1+j]!='\0';j++)
            {
                buff[j] = a[i-1+j];
            }
            buff[j] = '\0';
            for(j=i+1;buff[j-i-1]!='\0';j++)
            {
                a[j]=buff[j-i-1];

            }
            a[j] = '\0';
            i+=2;
        }
        last = a[i];
    }
    for (n = 0;a[n]!='\0';n++)
        {
            printf("%c", a[n]);
        }

    return 0;
}