#include<bits/stdc++.h>
using namespace std;
string rec(string ans, int x, int y){
if(x + y == 0){
return "";
}
if(x == 1 && y == 0) return ans + 'E';
if(x == -1 && y == 0) return ans + 'W';
if(x == 0 && y == 1) return ans + 'N';
if(x == 0 && y == -1) return ans + 'S';
if(x % 2 == 0){
if((((y + 1) + x) / 2) % 2 == 1) return ans + 'S' + rec(ans, x/2, (y +
1)/2);
if((((y - 1) + x) / 2) % 2 == 1) return ans + 'N' + rec(ans, x/2, (y -
1)/2);
}
if(y % 2 == 0){
if((((x + 1) + y) / 2) % 2 == 1) return ans + 'W' + rec(ans, (x + 1)/2,
y/2);
if((((x - 1) + y) / 2) % 2 == 1) return ans + 'E' + rec(ans, (x - 1)/2,
y/2);
}
}
void solve(){
int xx, yy;
cin>>xx>>yy;
int x = abs(xx);
int y = abs(yy);
int total = x + y;
if(total % 2 == 0){cout<<"IMPOSSIBLE"<<endl;return;}
string a = rec(a, abs(x), abs(y));
if(xx < 0 && yy < 0){
string opp = "";
for(char c: a){
if(c == 'N') opp += 'N';
if(c == 'S') opp += 'S';
if(c == 'E') opp += 'E';
if(c == 'W') opp += 'W';
}
a = opp;
}
if(xx < 0 && yy < 0){
string opp = "";
for(char c: a){
if(c == 'N') opp += 'S';
if(c == 'S') opp += 'N';
if(c == 'E') opp += 'W';
if(c == 'W') opp += 'E';
}
a = opp;
}
if(xx < 0 && yy > 0){
string opp = "";
for(char c: a){
if(c == 'N') opp += 'N';
if(c == 'S') opp += 'S';
if(c == 'E') opp += 'W';
if(c == 'W') opp += 'E';
}
a = opp;
}
if(xx > 0 && yy < 0){
string opp = "";
for(char c: a){
if(c == 'N') opp += 'S';
if(c == 'S') opp += 'N';
if(c == 'E') opp += 'E';
if(c == 'W') opp += 'W';
}
a = opp;
}
cout<<a<<endl;
}
int main(){
int t;
cin>>t;
for(int tt = 1; tt<=t; tt++){
cout<<"Case #"<<tt<<": ";
solve();
}
return 0;
}
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