/**
* @file homework.cpp
* @author ???
* @date 2011-11-16
* @description
* ??????: ????
*/
void Paidui(char[], int);

int main()
{
	int i, j, k;
	char a[1000];
	cin.getline(a, 1000);
	for (i=1;a[i]!='\0';i++) // ???1????2
	{
		if (a[i]==a[0]) a[i]=1;
		else a[i]=2;
	}
	a[0]=1;
	Paidui(a, 0);
	return 0;
}


void Paidui(char b[], int j)
{
	if (b[j]==2)
	{
		int k;
		for(k=j-1;k>=0;k--)
		{
			if (b[k]==1)
			{
				cout<<k<<" "<<j<<endl;
				b[k]=0;
				b[j]=0;
				break;
			}
		}
	}
	if (b[0]==0) return;
	Paidui(b, j+1);
}