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Cod sursa(job #78786)
program prefix;
const
fin='prefix.in';
fout='prefix.out';
type
sir=array[1..1000010] of char;
lsir=array[0..1000010] of longint;
var
t,i,j,n,k,q,l,x,y,it,best:longint;
f:text;
p:sir;
pi:lsir;
begin
assign(f,fin);assign(output,fout);
reset(f);rewrite(output);
readln(f,t);
for it:=1 to t do
begin
l:=0;
readln(f,p);
repeat
inc(l);
until (p[l]<'a')or(p[l]>'z');
dec(l);
k:=0;
pi[1]:=0;
for q:=2 to l do
begin
while (k>0) and (p[k+1]<>p[q]) do
k:=pi[k];
if p[k+1]=p[q] then
inc(k);
pi[q]:=k;
end;
best:=0;
for i:=l downto 2 do
if i-pi[i]<>0 then
begin
if (pi[i]<>0) then
if i mod (i-pi[i])=0 then
begin
best:=i;
break;
end;
end;
writeln(best);
end;
close(f);close(output);
end.