#include <bits/stdc++.h>
#define FOR(i,j,k) for(int i=j;i<=k;++i)
#define NFOR(i,j,k) for(int i=j;i>=k;--i)
#define mkp make_pair
#define fst first
#define sec second
#define inl inline
#define pb push_back
using namespace std;
typedef long long ll;
typedef double db;
typedef unsigned int ui;
typedef pair< int,int > pii;
inline int read()
{
	int s=0,w=1; char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-') w=-1; ch=getchar();}
	while(ch>='0'&&ch<='9'){s=(s<<1)+(s<<3)+ch-'0',ch=getchar();}
	return s*w;
}
void file()
{
	freopen(".in","r",stdin);
	freopen(".out","w",stdout);
}
void teltim(int x)
{
	clock_t c1=0;
	if(x) c1=clock();
	else cerr<<endl<<clock()-c1<<"ms"<<endl;
}
const int N=1e5+5;

int n;
char s[N];
int dp[N],x[N],stk[N][2],top;
char sd[7]={'I','V','X','L','C','D','M'};

bool chk(int i)
{
	bool ok=false;
	ok|=(s[i-2]=='M'&&s[i-1]=='C'&&s[i]=='M');		
	ok|=(s[i-2]=='C'&&s[i-1]=='X'&&s[i]=='C');
	ok|=(s[i-2]=='X'&&s[i-1]=='I'&&s[i]=='X');
	ok|=(s[i-2]=='M'&&s[i-1]=='M'&&s[i]=='M');
	ok|=(s[i-2]=='C'&&s[i-1]=='C'&&s[i]=='C');
	ok|=(s[i-2]=='X'&&s[i-1]=='X'&&s[i]=='X');
	ok|=(s[i-2]=='I'&&s[i-1]=='I'&&s[i]=='I');
	return ok;
}

int main()
{
	//file();
	n=read(); dp[0]=0;
	scanf("%s",s+1);
	FOR(i,1,n)
	{
		dp[i]=dp[i-1]+1;x[i]=1;
		if(i>=2)
		{
			if(s[i]==s[i-1]&&(s[i]=='M'||s[i]=='C'||s[i]=='X'||s[i]=='I'))
			{
				if(dp[i-2]+1<dp[i]) x[i]=2;dp[i]=dp[i-2]+1;
			}
		}
		if(i>=3)
		{
			if(chk(i))
			{
				if(dp[i-3]+1<dp[i])x[i]=3,dp[i]=dp[i-3]+1;
			}
		}
	}
	int cur=n;
	while(cur) 
	{
		stk[++top][0]=cur;
		stk[top][1]=x[cur];
		cur-=x[cur];
	}
	printf("%d\n",top);
	NFOR(i,top,1)
	{
		FOR(j,stk[i][0]-stk[i][1]+1,stk[i][0])
		printf("%c",s[j]);
		printf("\n");
	}
	return 0;
}
/*
M D C L X V I
*/
/*
CM CD XC XL IX IV
*/