#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

int fx[6]={1,-1,0,0,0,0};
int fy[6]={0,0,1,-1,0,0};
int fz[6]={0,0,0,0,1,-1};
char s[30];
int vis[4][4][4];
bool judge(int x,int y,int z)
{
    if(x<0||x>2||y<0||y>2||z<0||z>2||vis[x][y][z])
        return false;
    return true;
}
bool dfs(int x,int y,int z,int icount,int pos)
{
    char c=s[icount];
    int px = x+fx[pos];
    int py = y+fy[pos];
    int pz = z+fz[pos];
    if(icount==27)
        return judge(px,py,pz);
    if (!judge(px,py,pz))
        return false;
    if(c=='I')
    {
        vis[px][py][pz] = 1;
        if(dfs(px,py,pz,icount+1,pos))
            return true;
        else
        {
            vis[px][py][pz] =0;
            return false;
        }
    }
    else if(c=='L')
    {
        vis[px][py][pz] = 1;
        for (int i=0;i<6;i++)
        {
            if (i!=pos)
            {
                if(dfs(px,py,pz,icount+1,i))
                    return true;
            }
        }
        vis[px][py][pz] =0;
        return false;
    }
}
int main()
{
    while(~scanf("%s",s+1))
    {
        memset(vis,0,sizeof(vis));
        bool flag = false;
        for (int i=2;i<27;++i)
            if(s[i]=='E')
            {
                flag = true;
                break;
            }
        if(flag)
        {
            cout<<"NO";
            continue;
        }
        for (int i=0;i<3;++i)
        {
            for (int j=0;j<3;++j)
            {
                for (int k=0;k<3;++k)
                {
                    vis[i][j][k]=1;
                    if(dfs(i,j,k,2,0))
                    {
                        flag =true;
                        break;
                    }
                    vis[i][j][k]=0;
                }
                if(flag)
                    break;
            }
            if(flag)
                break;
        }
        if(flag)
            cout<<"YES";
        else
            cout<<"NO";
    }
    return 0;
}