const
n=5;
m=5;
var
a:array[1..n,1..m] of integer;
i,j:word;
begin
randomize;
writeln('Ishodniy massiv:');
for i:=1 to n do
for j:=1 to m do
begin
a[i,j]:=random(50)+1;
write(a[i,j]:3);
if j=m then writeln;
end;
for i:=1 to n do
for j:=1 to m do
if i mod 2 = 0 then
a[i,j]:=a[i,j] mod 2;
writeln('Preobrazovanniy massiv:');
for i:=1 to n do
for j:=1 to m do
begin
write(a[i,j]:3);
if j=m then writeln;
end;
readln;
end.