#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define endl '\n'
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define rep2(i,a,b) for(int i=int(a);i<int(b);i++)
#define pb emplace_back
#define all(x) (x).begin(),(x).end()
ll mod=1e9+7;
ll mod2=998244353;
const int INF=1e9;

signed main(){
	string s;
	cin>>s;
	ll a,b;
	a=(s[0]-'0')*10+(s[1]-'0');
	b=(s[2]-'0')*10+(s[3]-'0');

	if(a<=12&&b<=12&&a>0&&b>0){
		cout<<"AMBIGUOUS"<<endl;
	}else if(a<=12&&a>0){
		cout<<"MMYY"<<endl;
	}else if(b<=12&&b>0){
		cout<<"YYMM"<<endl;
	}else cout<<"NA"<<endl;
}

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