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