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{$mode objfpc}
uses math, clib;
var
n, m, i, j: int16;
(* For math compatibility *)
a: array of array of integer;
res: array of integer;
(* For clib compatibility *)
rowmin: array of int64;
colmax: int64;
begin
readln(n, m);
setlength(a, n);
setlength(rowmin, n);
for i := 0 to n - 1 do
begin
setlength(a[i], m);
for j := 0 to m - 1 do
read(a[i][j]);
rowmin[i] := minvalue(a[i])
end;
qsort(rowmin);
setlength(res, 0);
for j := 0 to m - 1 do
begin
colmax := a[0][j];
for i := 1 to n - 1 do
if a[i][j] > colmax then
colmax := a[i][j];
if bsearch(rowmin, colmax) > -1 then
begin
setlength(res, length(res) + 1);
res[length(res) - 1] := colmax
end
end;
writeln(length(res));
for i in res do
write(i, ' ');
writeln
end.
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