/*
Se citeste un cuvant.
Sa verifice daca este palindorm.
Nu facem diferente intre litere mici si mari
Exemple: Ana, cojoc, Minim...
*/
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char a[100];
int i,j,ok=1;
cin>>a;
for(i=0;i<strlen(a);i++)
if(isupper(a[i]))
a[i]=tolower(a[i]);
i=0;
j=strlen(a)-1;
while(i<j)
{
if(a[i]!=a[j])
ok=0;
i++;
j--;
}
if(ok==1)
cout<<"da";
else
cout<<"nu";
return 0;
}
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