int main()
{
	int n,i,j;
	char jianji[1000][256];
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%s",jianji[i]);
		for(j=0;j<(int)strlen(jianji[i]);j++)
		{
			if(jianji[i][j]=='A')
			{
				jianji[i][j]='T';
			}
			else if(jianji[i][j]=='T')
			{
				jianji[i][j]='A';
			}
			else if(jianji[i][j]=='C')
			{
				jianji[i][j]='G';
			}
			else 
			{
				jianji[i][j]='C';
			}
		}

	}
			for(i=0;i<n;i++)
			{
				printf("%s\n",jianji[i]);
			}

	return 0;
}