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#include <cstdio>
#include <iostream>
#include <cstring>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <list>
#include <bitset>
#include <queue>
#include <stack>
#include <cmath>
#include <valarray>
#include <ctime>
#include <set>
#include <sstream>
#include <stdarg.h>


using namespace std;

#define x first
#define y second
#define mp make_pair
#define sqr(a) ((a) * (a))

#define BIT(n, k) ( ((n) >> (k)) & 1 )

typedef pair<int, int> pi;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<string> vs;
typedef vector<char> vc;
typedef vector<double> vd;

typedef unsigned char       u8;
typedef unsigned short     u16;
typedef unsigned int       u32;
typedef unsigned long long u64;

int main(int argc, u8* argv[]) {    
#ifdef LOCAL_TEST
    freopen("in.in", "r", stdin);
#endif
    char buf[100] = {0};
    scanf("%s\n", buf);
    int n;
    scanf("%d", &n);
    int len = strlen(buf);
    for (int i = 0; i < len; ++i) {
        if (buf[i] - 'a' < n) {
            buf[i] = toupper(buf[i]);
        } else {
            buf[i] = tolower(buf[i]);
        }
    }
    printf("%s\n", buf);
    return 0;
}

