int main()
{
    int n,i,j,k,p,m;
    char a[20][25];
    scanf("%d", &n);
    for(i=1;i<=n;i++)
    {
                     m=0;
                     scanf("%s", a[i]);
                     p=strlen(a[i]);
                     k=a[i][0];
                     if(k==95||(k>=65&&k<=90)||(k>=97&&k<=122))
                     {
                             for(j=1;j<=p-1;j++)
                             {
                                               k=a[i][j];
                                               if(k<=47||(k>=58&&k<=64)||(k>=91&&k<=94)||k==96||k>=123)
                                               {
                                                        printf("no\n");
                                                        m=1;
                                                        break;
                                               }
                             }
                     }
                     else {printf("no\n"); m=1;}
                     if(m==0) printf("yes\n");
    }
    return 0;
}
