programming help

I am writing a program which will find matching position of similar charecter between three sequences.
1 2 3 4 5 6 7 8 9
suppose, S1=T C C A T A G T C
S2=A G C T A A T A G
S3=G G A T T A G C T
Now, I want to print for A like,
(4,1,3)
(6,5,6)
(0,6,0)
(0,8,0)
For T,
(1,4,4)
(5,7,5)
(8,0,9)
For G,
(7,2,1),
(0,9,2)
(0,0,7)
For C,
(2,3,8)
(3,0,0)
(9,0,0)
plz,help me....

 

#include <stdio.h>

int main()
{
int s1[9]={'T','C','C','A','T','A','G','T','C'};
int loop;

for(loop=0;loop<9;loop++)
{
if(s1[loop]=='T')
printf("%d\t",loop+1);
}
return 0;
}