//Bismillahir Rahmanir Rahim
/******Harun Or Rashid******/
/***********Template Starts Here***********/
#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<cctype>
#include<cstdlib>
#include<cassert>
#include<string>
#include<vector>
#include<set>
#include<stack>
#include<queue>
#include<map>
#include<algorithm>
using namespace std;

#define MEM(a,b) memset(a,b,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)>(b)?(b):(a))
#define ABS(a) ((a)>0? (a):(-(a)))
#define SQ(a) ((a)*(a))
#define SZ(a) (int)a.size()
#define FORN(i,n) for(i=1;i<=n;i++)
#define FORAB(i,a,b) for(i=a;i<=b;i++)
#define ALL(V) V.begin(),V.end()
#define pb(a) push_back(a)
#define pr(a) cout<<a<<endl
#define SQR(a) ((a)*(a))
#define pf printf
#define sf scanf
#define mp make_pair
#define swap(a,b) (a ^= b, b ^= a, a ^= b)
#define PI acos(-1)
#define x first
#define y second
#define eps 1e-7

typedef int D;
typedef long long int LLD;
typedef unsigned long long int LLU;
typedef vector<D> VI;
typedef set<D> SI;
typedef vector<D>::iterator Viti;

/***********Template Ends Here***********/

int gcd(int a,int b)
{
    if(b==0) return a;
    return gcd(b,a%b);
}

int lcm(int a,int b)
{
    return a*(b/gcd(a,b));
}

int main()
{
    char str[21];
    int i,cnt,ans;
    while(1)
    {
        cin>>str;
        if(str[0]=='*') break;
        vector<int>tocheak;
        vector<int>tocount;
        for(i=0; str[i] ; i++)
        {
            if(str[i]=='N') tocheak.pb(i+1);
            else tocount.pb(i+1);
        }
        if(tocount.size())
        {
            cnt=tocount[0];
            for(i=1; i<tocount.size(); i++)
                cnt=lcm(cnt,tocount[i]);
            ans=cnt;
            for(i=0; i<tocheak.size(); i++)
            {
                if(cnt%tocheak[i]==0)
                {
                    ans=-1;
                    break;
                }
            }
            cout<<ans<<endl;
        }
        else cout<<-1<<endl;
    }
    return 0;
}