Every day, Selvan goes to his office by train and buys the ticket from the counter on the day of travel. On the ticket, there is a letter-code that is represented as a string of upper-case Latin letters.Selvan believes that the day will be successful in case exactly two different letters in the code alternate.

 #include <stdio.h>

int main()

{   int n;

    char ticketnumber[102];

    scanf("%d",&n);

    for (int i=0;i<n;i++)

    {   

        scanf("%s",ticketnumber);

        if(ticketnumber[0]!=ticketnumber[2]||ticketnumber [1]!=ticketnumber[3]||ticketnumber[3]!=ticketnumber [5])

        {printf("NO\n");}

        else

        {printf("YES\n");}

    }

return 0;

}

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