POJ 1317

#include <iostream>
#include <string>
using namespace std;

char p_code[] = {'_','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','.'};
int c_code[100];
int ans[100];

int main()
{
    //freopen("acm.acm","r",stdin);
    int k;
    int n;
    int i;
    string s;
    
    while(cin>>k,k)
    {
        cin>>s;
        n = s.length();
        for(i = 0; i < n; ++ i)
        {
            if(s[i] >= 'a' && s[i] <= 'z')
            {
                c_code[i] = (s.at(i)-'a');
                ans[(k*i)%n] = (c_code[i]+1)%28+i;
            }
            else if(s[i] == '_')
            {
                ans[(k*i)%n] = (0+i);
            }
            else if(s[i] == '.')
            {
                ans[(k*i)%n] = (27+i);
            }
        }
        for(i = 0; i < n; ++ i)
        {
            cout<<p_code[ans[i]%28];    
        }
        cout<<endl;
        
    }
}

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