var
s:string;
i,j:integer;
begin
readln(s);
for i:=1 to Length(s) do
for j:=1 to Length(s) do
if (s[i]=s[j]) and (i<>j) then
begin
writeln('Yes');
exit
end;
writeln('No')
end.
var
s:string;
i,j:integer;
begin
readln(s);
for i:=1 to Length(s) do
for j:=1 to Length(s) do
if (s[i]=s[j]) and (i<>j) then
begin
writeln('Yes');
exit
end;
writeln('No')
end.