Var n,m,i,j,k,s,s1:longint;
y:array[1..10000,1..10000] of longint;
o:array[1..10000] of longint;
begin
read(n,m);
for i:=1 to n do
for j:=1 to m do
read(y[i,j]);
for i:=1 to n do
for j:=1 to n do
if ji then
begin  for k:=1 to m do 
 if y[i,k]=y[j,k] then   inc(s); 
if s=m then 
begin
if o[i]=0 then 
begin 
writeln(i); 
o[i]:=1; 
end; 
if o[j]=0 then
begin 
 writeln(j); 
o[j]:=1; 
end; 
inc(s1); 
end; 
s:=0;
end;
writeln(s1);
end.