#include<stdio.h>
#include<string.h>
int main()
{
char a
[500];
int n
,len
,begin
,maxBegin
,i
,j
;
scanf("%s",a
);
n
=strlen(a
);
for(len
=2;len
<=n
;len
++)
{
maxBegin
=n
-len
;
for(begin
=0;begin
<=maxBegin
;begin
++)
{
j
=begin
+len
-1;
for(i
=begin
;i
<j
;i
++,j
--)
{
if(a
[i
]!=a
[j
]) break;
}
if(i
>=j
)
{
j
=begin
+len
-1;
for(i
=begin
;i
<=j
;i
++) printf("%c",a
[i
]);
printf("\n");
}
}
}
return 0;
}
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