#include<bits/stdc++.h>
using namespace std;
using Int=long long;
using Real=long double;
template<class T,class S>inline bool chmin(T&A,S B){if(A>B){A=B;return true;}else{return false;}}
template<class T,class S>inline bool chmax(T&A,S B){if(A<B){A=B;return true;}else{return false;}}
#define REP(i,n)for(int i=0;i<(n);++i)
#define REP1(i,n)for(int i=1;i<=(n);++i)
#define ALL(x)begin(x),end(x)
#define drop(x){cout<<(x)<<'\n';return;}
string S;
void sol()
{
	cin>>S;
	int ans=114514;
	REP(i,size(S))if(S[i]=='c')
	{
		int cnt=0;
		for(int j=i+1;j<size(S);++j)
		{
			cnt+=S[j]=='w';
			if(cnt>=2)
			{
				chmin(ans,j-i+1);
				break;
			}
		}
	}
	if(ans==114514)ans=-1;
	cout<<ans<<"\n";
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	cout<<fixed<<setprecision(16);
	int TE=1;
	//cin>>TE;
	while(TE--)sol();
}