#include <stdlib.h>
#include <stdio.h>
#include <string.h>



int main(int argc, char *argv[])
	{
	int i;
	char *seq;
	char revseq[1028];
	if(argc!=2)
		{
		printf("Give sequence as parameter");
		exit(1);
		}
	else
		{
		seq=argv[1];

		//Complement sequence
		for(i=0;i<strlen(seq);i++)
			{
			if(seq[i]=='A')
				{
				seq[i]='T';
				}
			else if(seq[i]=='T')
				{
				seq[i]='A';
				}


			}

		//Reverse sequence
		for(i=0;i<strlen(seq);i++)
			revseq[strlen(seq)-i-1]=seq[i];
		revseq[strlen(seq)]=0;

		printf("Complement reverse: %s\n", revseq);
		}
	return 0;
	}