glebhueb

var
c,e,f,h,i,j,n,r,w,a,b,x,y : integer;
u: char;
mas : array [1..1000,1..1000] of char;
begin
read(h,w,n);
for i:=1 to h do begin
for j:=1 to w do begin
mas[i][j]:='.';
end; end;
for i:=1 to n do begin
case (i) of
1: u:='a';
2: u:='b';
3: u:='c';
4: u:='d';
5: u:='e';
6: u:='f';
7: u:='g';
8: u:='h';
9: u:='i';
10: u:='j';
11: u:='k';
12: u:='l';
13: u:='m';
14: u:='n';
15: u:='o';
16: u:='p';
17: u:='q';
18: u:='r';
19: u:='s';
20: u:='t';
21: u:='u';
23: u:='v';
24: u:='w';
25: u:='x';
26: u:='y';
27: u:='z';
end;
read(r,c,e,f);
a:=r; b:=c;
for r:=r to e do begin
for c:=c to f do begin
mas[r][c]:=u;
end; end;
for x:=f downto a do begin
mas[e][x]:=u;
end;
for y:=e downto b do begin
mas[y][x]:=u;
end;
end;
for i:=1 to h do begin
for j:=1 to w do begin
write(mas[i,j]);
end; writeln(); end;
end.