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# include "iostream"
# include "conio.h"
# include "stdio.h"
# include <string>
# include "algorithm"
# include "vector"
# include "map"
# include "math.h"
# include "queue"
# include "stack"
# include "fstream"
using namespace std;
vector <char> used;
void main()
{ 
    int n;
    string s,p;
    cin>>s;
    cin>>n;
    p="";

s[0]=tolower(s[0]);
    for(int i=0; i<s.length(); i++)
    {
        
        if(s[i]<n+97)
        {
            p+=toupper(s[i]);
        }
        else
            p+=tolower(s[i]);
    }
    cout<<p;


    

    }
