import java.io.BufferedInputStream; import java.io.IOException; import java.math.BigDecimal; import java.math.BigInteger; import java.util.*; import java.util.Map.Entry; import java.util.concurrent.ConcurrentSkipListSet; public class Main { public static final int C = 1000000007; static final int CY = 1000000000; //static boolean MAP[][]; static int N; static int M; static int[][] DIF; static String S; static int K; static int X[][]; //static String S[]; static int HA[]; static long DP[]; static int ST[][]; static ConcurrentSkipListSet TS; static ArrayList AL; public static void main(String[] args) { StringBuilder sb = new StringBuilder(); BufferedInputStream bs = new BufferedInputStream(System.in); Scanner sc = new Scanner(bs); String str = sc.next(); String ans = ""; int d = 'a' - 'A'; char[] cs = str.toCharArray(); for (int i=0; i < str.length(); i++) { if (cs[i] <='Z' ) { cs[i] += d; }else { cs[i] -= d; } } ans = new String(cs); System.out.println(ans); } }