#include<bits/stdc++.h>
using namespace std;
int A,ida,B,idb,C,idc;
vector< pair<int,int> > ans;
void init(){if(A>B)swap(A,B),swap(ida,idb);if(A>C)swap(A,C),swap(ida,idc);if(B>C)swap(B,C),swap(idb,idc);}
int main(){
    scanf("%d%d%d",&A,&B,&C);ida=1,idb=2,idc=3;
    while(init(),A){
        int base=A;
        while(A/base<=B/base){
            if((B/base)&(A/base))B-=A,A+=A,ans.push_back({idb,ida});
            else C-=A,A+=A,ans.push_back({idc,ida});
        }
    }
    printf("%d\n",ans.size());
    for(pair<int,int> &x:ans)printf("%d %d\n",x.first,x.second);
}