main(n){float r,i,R,I,b;for(i=-1;i<1;i+=.06,puts(""))for(r=-2;I=i,(R=r)<1; r+=.03,putchar(n+31))for(n=0;b=I*I,26>n++&&R*R+b<4;I=2*R*I+i,R=R*R-b+r);}

C is awesome - try this code, and play around with the numbers

(I didn't write this)