var line =readline();
var len = line.length;
var n=0,max=0;
function comp(a,b) {
	return a !=b;
}
if(len == 1) {
	max = 0;
} else{
	for(var i=0;i<len-1;i++) {
		if(comp(line[i],line[i+1]){
		     n++;
		     if(i+1 != len-1) continue;
		}
	max = max > n ? max : n;
	n = 0;
	}
}
if(max != 0) max++;
print(max);