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

