int main()
{
	int n;
	scanf("%d",&n);
	char zfc[50][20];
	int i,j;
	for(i=0;i<n;i++){
		scanf("%s",zfc[i]);
		int k;
		int flag=0;
		k=strlen(zfc[i]);
		if(zfc[i][0]==95 || (zfc[i][0]>=65 && zfc[i][0]<=90) || (zfc[i][0]>=97 && zfc[i][0]<=122)){
			flag=1;
			for(j=1;j<k;j++){
				if(zfc[i][j]==95 || (zfc[i][j]>=65 && zfc[i][j]<=90) || (zfc[i][j]>=97 && zfc[i][j]<=122) || zfc[i][j]=='0' || zfc[i][j]=='1' || zfc[i][j]=='2' || zfc[i][j]=='3' || zfc[i][j]=='4' || zfc[i][j]=='5' || zfc[i][j]=='6' || zfc[i][j]=='7' || zfc[i][j]=='8' || zfc[i][j]=='9'){
					flag++;
				}
			}
			if(flag==k){
				printf("yes\n");
			}else{
				printf("no\n");
			}
		}else{
			printf("no\n");
		}
	}
	return 0;
}
