int main()
{
    char zfc[2000][400];
	int i,j,n;
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%s",zfc[i]);
	}

    for(i=0;i<n;i++){
		for(j=0;zfc[i][j]!='\0';j++){
			if(zfc[i][j]=='A'){
				zfc[i][j]='T';
				continue;
			}
			if(zfc[i][j]=='T'){
				zfc[i][j]='A';
				continue;
			}
            if(zfc[i][j]=='G'){
				zfc[i][j]='C';
				continue;
			}
			if(zfc[i][j]=='C'){
				zfc[i][j]='G';
				continue;
			}
		}
	}
    for(i=0;i<n;i++){
			printf("%s\n",zfc[i]);
	}
	return 0;
}