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#include <iostream>
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using namespace std;
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int main() {
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    char x,y,z;
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    cin>>x>>y>>z;
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    //RRR || SSS
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    if(x==y&&y==z&&x=='R') {
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        cout<<3;
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    }
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    else if((x==y ||y==z)&&y=='R')
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    {
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        //RRS || SRR
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        cout<<2;
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    }
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    else if(x=='R'||y=='R'||z=='R')
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    {
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        //SSR || SRS || RSS
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        cout<<1;
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    }
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    else
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        cout<<0;
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}