#include <fstream>
#include <cstring>
using namespace std;
char v[501];
int pal(int st,int dr) {
    while (st<dr) {
        if (v[st]!=v[dr]) return 0;
        ++st;
        --dr;
    }
    return 1;
}
int cresc(int st,int dr) {
   int i,d=(dr+st)/2;
    for (i=st+1;i<=d;++i)
        if (v[i]<v[i-1]) return 0;
     return 1;
}
int main()
{ int n,i,Max=0,j;
    ifstream f("palm.in");
    ofstream g("palm.out");
    f.get(v,501);
    n=strlen(v);
    for (i=0;i<n;++i)
    for (j=0;j<=i;++j)
        if (pal(j,i) && cresc(j,i)) {
            Max=max(Max,i-j+1);
            break;
        }
      g<<Max;
    return 0;
}