#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
	int a=0,c=0;
	char jie[1000][7];
	while (scanf("%s",jie[c++]));
	cout<<c;
	
	for(int j=0;j<c;++j)
    {
	    for(int m=0;m<strlen(jie[c-j-1]);++m)
	    {
		   int d=strlen(jie[c-j-1]);
		   if(jie[c-j-1][m]>='A'&&jie[c-j-1][m]<='Z') {jie[c-j-1][m]+=32; cout<<jie[c-j-1][m];}
		   if(jie[c-j-1][m]>='a'&&jie[c-j-1][m]<='z') {jie[c-j-1][m]-=32; cout<<jie[c-j-1][m];}
		   if(jie[c-j-1][m]>='0'&&jie[c-j-1][m]<='9') cout<<jie[c-j-1][d-m-1];
	    }
	}
		cout<<" ";
	return 0;
}