#include<bits/stdc++.h>
        #include <bitset>
        using namespace std;
        #define ll long long 
        #define ld long double
        #define MOD 1000000007
        #define mod9 1000000009
        #define fast ios_base :: sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
        #define mp make_pair
        #define pb push_back
        #define ct ll t;cin>>t;while(t--)
        #define bi begin()
        #define ei end()
        #define fi first 
        #define se second  
        #define foe(a,b) for(ll i=a;i<b;i++)
		#define sz(s) s.size()     
        bool isPrime(ll n) 
        { 
            // Corner case 
            if (n <= 1) 
                return false; 
            
            // Check from 2 to n-1 
            for (ll i = 2; i*i <= n; i++) 
                if (n % i == 0) 
                    return false; 
            
            return true; 
        }
        long long binpow(long long a, long long b) {
            long long res = 1;
            while (b > 0) {
                if (b & 1)
                    res = (res) * (a);
                a = (a) * (a);
                b >>= 1;
            }
            return res;
        }

        bool compare(const pair<ll,ll>&a,const pair<ll,ll>&b)
        {
            return (a.se<b.se);
        }
        ll lcm(ll a,ll b)
        {
            return(a*b)/__gcd(a,b);
        }
        // vector<ll>s;
        // set<ll>t;
        void SieveOfEratosthenes() 
        {  
            ll n=100005;
            bool prime[100005]={false};
            // s[0]=0;
            // s[1]=1;
            // s.pb(1);
            // t.insert(1);
            for (int p=2; p<=n; p++) 
            { 
                
               if(prime[p]==false)
               {
                   for(ll j=p+p;j<=100005;j+=p)
                   {
                       prime[j]=true;
                   }    
               }
            } 
            for(ll i=2;i<100005;i++)
            {
                if(!prime[i])
                {
                    // s.pb(i);
                    // t.insert(i);
                }
            }
        } 
        void eea(ll a, ll b, ll & x, ll & y) {
        if (a == 0) {
            x = 0;
            y = 1;
            return ;
        }
        ll x1, y1;
        eea(b % a, a, x1, y1);
        x = y1 - (b / a) * x1;
        y = x1;
        return ;
    }
    ll modinverse(ll a,ll m)
    {
        ll x, y;
        eea(a, m, x, y);
        if (__gcd(a,m) != 1) {
        return -1;
        }
    else {
        x = (x % m + m) % m;
        cout << x << endl;
        return x;
    }
    }
        ll fact[1000007]={0};
        ll expo(ll x, ll y) {ll res=1;x=x%MOD;while(y>0){if(y&1)res=(1ll*res*x)%MOD;
        y=y>>1;x=(1ll*x*x)%MOD;} return res;}
        void facto() {fact[0]=1;fact[1]=1;for(ll i=2;i<100007;i++)fact[i]=(fact[i-1]*i)%MOD;}
        ll npr(ll n,ll r) {facto(); ll res=1; res=fact[n]; res=(res*(expo(fact[n-r],MOD-2)))%MOD; return res; }
        ll ncr(ll n,ll r){ ll res=1; if(r>n-r)r=n-r; for(ll i=0;i<r;i++) {  res*=n-i;  res/=i+1; } return res;}
            ll C(ll n, ll k) {
    ll res = 1;
    for (ll i = 1; i <= k; ++i)
        res = ((res) * (n - k + i) / i)%MOD;
    return (ll)(res + 0.01)%MOD;
}

        int main()
        {
            fast
            // SieveOfEratosthenes();
           
        //    ct
			 { 
                string s;
                cin>>s;
                if(s=="ABC")
                {
                    cout<<"ARC\n";
                }
                else
                {
                    cout<<"ABC\n";
                }
             }
        }


Measured memory_bytes: 3572