const
n=10;
m=20;
var
a:array[1..n,1..m] of integer;
i,j,t:integer;
begin
for i:=1 to n do
begin
for j:=1 to m do
begin
a[i,j]:=random(40);
write(' ',a[i,j]:3);
end;
writeln();
end;
writeln('--------') ;
for i:=1 to n do
for j:=1 to m do
if odd(i)then
begin
t:=a[i,j];
a[i,j]:=a[i+1,j];
a[i+1,j]:=t;
end;
writeln('--------') ;
for i:=1 to n do
begin
for j:=1 to m do
begin
write(' ',a[i,j]:3);
end;
writeln();
end;
end.